Sec. 90.23 Highway Maintenance Radio Service.
(a) Eligibility. Any territory, possession, State, county, city,
town, and similar governmental entity is eligible to hold authorizations
in the Highway Maintenance Radio Service to operate stations for
transmission of communications essential to official highway activities
of the licensee.
(b) Frequencies available. The following table indicates frequencies
available for assignment to stations in the Highway Maintenance Radio
Service, together with the class of station(s) to which they are
normally assigned and the specific assignment limitations which are
explained in paragraph (c) of this section:
Highway Maintenance Radio Service Frequency Table
------------------------------------------------------------------------
Frequency or band Class of station(s) Limitations
------------------------------------------------------------------------
Megahertz
------------------------------------------------------------------------
33.02.............................. Base or mobile........ 1
33.06.............................. ......do.............. 1
33.10.............................. ......do.............. 1
37.90.............................. ......do.............. 1
37.92.............................. ......do.............. ...........
37.94.............................. ......do.............. 1
37.96.............................. ......do.............. ...........
37.98.............................. ......do.............. 1
45.68.............................. ......do.............. ...........
45.72.............................. ......do.............. ...........
45.76.............................. ......do.............. ...........
45.80.............................. ......do.............. ...........
45.84.............................. ......do.............. ...........
47.02.............................. ......do.............. 2, 17
47.04.............................. ......do.............. 2, 17
47.06.............................. ......do.............. 2, 17
47.08.............................. ......do.............. 2, 17
47.10.............................. ......do.............. 2, 17
47.12.............................. ......do.............. 2, 17
47.14.............................. ......do.............. 2, 17
47.16.............................. ......do.............. 2, 17
47.18.............................. ......do.............. 2, 17
47.20.............................. ......do.............. 2, 17
47.22.............................. ......do.............. 2, 17
47.24.............................. ......do.............. 2, 17
47.26.............................. ......do.............. 2, 17
47.28.............................. ......do.............. 2, 17
47.30.............................. ......do.............. 2, 17
47.32.............................. ......do.............. 2, 17
47.34.............................. ......do.............. 2, 17
47.36.............................. ......do.............. 2, 17
47.38.............................. ......do.............. 2, 17
47.40.............................. ......do.............. 2, 17
72.00 to 76.00..................... Operational fixed..... 3
150 to 170......................... Base or mobile........ 21, 24
150.995............................ ......do.............. 4
151.0025........................... ......do.............. 4, 18
151.010............................ ......do.............. 4
151.0175........................... ......do.............. 4, 18
151.025............................ ......do.............. 4
151.0325........................... ......do.............. 4, 18
151.040............................ ......do.............. 4
151.0475........................... ......do.............. 4, 18
151.055............................ ......do.............. 4
151.070............................ ......do.............. 4, 22
151.085............................ ......do.............. 4
151.0925........................... ......do.............. 4, 18
151.100............................ ......do.............. 4
151.1075........................... ......do.............. 4, 18
151.115............................ ......do.............. 4
151.1225........................... ......do.............. 4, 18
151.130............................ ......do.............. 4
151.1375........................... ......do.............. 4, 18
156.045............................ Mobile................ 14
156.0525........................... ......do.............. 14, 18
156.060............................ ......do.............. 14
156.0675........................... ......do.............. 14, 18
156.075............................ ......do..............
156.0825........................... ......do.............. 18
156.105............................ Base or mobile........
156.1125........................... ......do.............. 18
156.120............................ ......do..............
156.1275........................... ......do.............. 18
156.135............................ ......do..............
156.1425........................... ......do.............. 18
156.165............................ ......do.............. 5, 14
156.1725........................... ......do.............. 5, 14, 18
156.180............................ ......do.............. 5, 14
156.1875........................... ......do.............. 5, 14, 18
156.195............................ ......do.............. 5
156.2025........................... ......do.............. 5, 18
156.225............................ ......do.............. 5
156.2325........................... ......do.............. 5, 18
156.240............................ ......do.............. 5
156.2475........................... ......do.............. 5, 20
158.985............................ Mobile................ 5
158.9925........................... ......do.............. 5, 18
159.000............................ ......do.............. 5
159.0075........................... ......do.............. 5, 18
159.015............................ ......do.............. 5
159.0225........................... ......do.............. 5, 18
159.045............................ ......do.............. 5
159.0525........................... ......do.............. 5, 18
159.060............................ ......do.............. 5
159.0675........................... ......do.............. 5, 18
159.075............................ ......do.............. 5
159.0825........................... ......do.............. 5, 18
159.105............................ Base or mobile........ 5
159.1125........................... ......do.............. 5, 18
159.120............................ ......do.............. 5
159.1275........................... ......do.............. 5, 18
159.135............................ ......do.............. 5
159.1425........................... ......do.............. 5, 18
159.165............................ ......do.............. 5
159.1725........................... ......do.............. 5, 18
159.180............................ ......do..............
159.1875........................... ......do.............. 18
159.195............................ ......do..............
159.2025........................... ......do.............. 18
169-172............................ Mobile................ 15
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220-222............................ Base and mobile....... 19
450-470............................ Fixed, base, or mobile 7, 21
453.0375........................... Mobile................ 23
453.050............................ Base or mobile........ 8
453.05625.......................... ......do.............. 8, 20
453.06250.......................... ......do.............. 8, 18
453.06875.......................... ......do.............. 8, 20
453.0875........................... Mobile................ 23
453.100............................ Base or mobile........ 8
453.10625.......................... ......do.............. 8, 20
453.11250.......................... ......do.............. 8, 18
453.11875.......................... ......do.............. 8, 20
453.1375........................... Mobile................ 23
453.150............................ Base or mobile........ 8
453.15625.......................... ......do.............. 8, 20
453.16250.......................... ......do.............. 8, 18
453.16875.......................... ......do.............. 8, 20
453.1875........................... Mobile................ 23
453.200............................ Base or mobile........ 8
453.20625.......................... ......do.............. 8, 20
453.21250.......................... ......do.............. 8, 18
453.21875.......................... ......do.............. 8, 20
453.2375........................... Mobile................ 23
453.250............................ Base or mobile........ 8
453.25625.......................... ......do.............. 8, 20
453.26250.......................... ......do.............. 8, 18
453.26875.......................... ......do.............. 8, 20
453.2875........................... Mobile................ 23
453.300............................ Base or mobile........ 8
453.30625.......................... ......do.............. 8, 20
453.31250.......................... ......do.............. 8, 18
453.31875.......................... ......do.............. 8, 20
453.3375........................... Mobile................ 23
453.350............................ Base or mobile........ 8
453.35625.......................... ......do.............. 8, 20
453.36250.......................... ......do.............. 8, 18
453.36875.......................... ......do.............. 8, 20
453.3875........................... Mobile................ 23
453.400............................ Base or mobile........ 8
453.40625.......................... ......do.............. 8, 20
453.41250.......................... ......do.............. 8, 18
453.41875.......................... ......do.............. 8, 20
453.4375........................... Mobile................ 23
453.450............................ Base or mobile........ 8
453.45625.......................... ......do.............. 8, 20
453.46250.......................... ......do.............. 8, 18
453.46875.......................... ......do.............. 8, 20
453.4875........................... Mobile................ 23
453.500............................ Base or mobile........ 8
453.50625.......................... ......do.............. 8, 20
453.51250.......................... ......do.............. 8, 18
453.51875.......................... ......do.............. 8, 20
453.5375........................... Mobile................ 23
453.550............................ Base or mobile........ 8
453.55625.......................... ......do.............. 8, 20
453.56250.......................... ......do.............. 8, 18
453.56875.......................... ......do.............. 8, 20
453.5875........................... Mobile................ 23
453.600............................ Base or mobile........ 8
453.60625.......................... ......do.............. 8, 20
453.61250.......................... ......do.............. 8, 18
453.61875.......................... ......do.............. 8, 20
453.6375........................... Mobile................ 23
453.650............................ Base or mobile........ 8
453.65625.......................... ......do.............. 8, 20
453.66250.......................... ......do.............. 8, 18
453.66875.......................... ......do.............. 8, 20
453.6875........................... Mobile................ 23
453.700............................ Base or mobile........ 9
453.70625.......................... ......do.............. 9, 20
453.71250.......................... ......do.............. 9, 18
453.71875.......................... ......do.............. 9, 20
453.7375........................... Mobile................ 23
453.750............................ Base or mobile........ 8
453.75625.......................... ......do.............. 8, 20
453.76250.......................... ......do.............. 8, 18
453.76875.......................... ......do.............. 8, 20
453.7875........................... Mobile................ 23
453.800............................ Base or mobile........ 8
453.80625.......................... ......do.............. 8, 20
453.81250.......................... ......do.............. 8, 18
453.81875.......................... ......do.............. 8, 20
453.8375........................... Mobile................ 23
453.850............................ Base or mobile........ 8
453.85625.......................... ......do.............. 8, 20
453.86250.......................... ......do.............. 8, 18
453.86875.......................... ......do.............. 8, 20
453.8875........................... Mobile................ 23
453.900............................ Base or mobile........ 8
453.90625.......................... ......do.............. 8, 20
453.91250.......................... ......do.............. 8, 18
453.91875.......................... ......do.............. 8, 20
453.9375........................... Mobile................ 23
453.950............................ Base or mobile........ 8
453.95625.......................... ......do.............. 8, 20
453.96250.......................... ......do.............. 8, 18
453.96875.......................... ......do.............. 8, 20
458.0375........................... Mobile................ 23
458.050............................ ......do.............. 8
458.05625.......................... ......do.............. 8, 20
458.06250.......................... ......do.............. 8, 18
458.06875.......................... ......do.............. 8, 20
458.0875........................... ......do.............. 23
458.100............................ ......do.............. 8
458.10625.......................... ......do.............. 8, 20
458.11250.......................... ......do.............. 8, 18
458.11875.......................... ......do.............. 8, 20
458.1375........................... ......do.............. 23
458.150............................ ......do.............. 8
458.15625.......................... ......do.............. 8, 20
458.16250.......................... ......do.............. 8, 18
458.16875.......................... ......do.............. 8, 20
458.1875........................... ......do.............. 23
458.200............................ ......do.............. 8
458.20625.......................... ......do.............. 8, 20
458.21250.......................... ......do.............. 8, 18
458.21875.......................... ......do.............. 8, 20
458.2375........................... ......do.............. 23
458.250............................ ......do.............. 8
458.25625.......................... ......do.............. 8, 20
458.26250.......................... ......do.............. 8, 18
458.26875.......................... ......do.............. 8, 20
458.2875........................... ......do.............. 23
458.300............................ ......do.............. 8
458.30625.......................... ......do.............. 8, 20
458.31250.......................... ......do.............. 8, 18
458.31875.......................... ......do.............. 8, 20
458.3375........................... ......do.............. 23
458.350............................ ......do.............. 8
458.35625.......................... ......do.............. 8, 20
458.36250.......................... ......do.............. 8, 18
458.36875.......................... ......do.............. 8, 20
458.3875........................... ......do.............. 23
458.400............................ ......do.............. 8
458.40625.......................... ......do.............. 8, 20
458.41250.......................... ......do.............. 8, 18
458.41875.......................... ......do.............. 8, 20
458.4375........................... ......do.............. 23
458.450............................ ......do.............. 8
458.45625.......................... ......do.............. 8, 20
458.46250.......................... ......do.............. 8, 18
458.46875.......................... ......do.............. 8, 20
458.4875........................... ......do.............. 23
458.500............................ ......do.............. 8
458.50625.......................... ......do.............. 8, 20
458.51250.......................... ......do.............. 8, 18
458.51875.......................... ......do.............. 8, 20
458.5375........................... ......do.............. 23
458.550............................ ......do.............. 8
458.55625.......................... ......do.............. 8, 20
458.56250.......................... ......do.............. 8, 18
458.56875.......................... ......do.............. 8, 20
458.5875........................... ......do.............. 23
458.600............................ ......do.............. 8
458.60625.......................... ......do.............. 8, 20
458.61250.......................... ......do.............. 8, 18
458.61875.......................... ......do.............. 8, 20
458.6375........................... ......do.............. 23
458.650............................ ......do.............. 8
458.65625.......................... ......do.............. 8, 20
458.66250.......................... ......do.............. 8, 18
458.66875.......................... ......do.............. 8, 20
458.6875........................... ......do.............. 23
458.700............................ ......do.............. 8
458.70625.......................... ......do.............. 8, 20
458.71250.......................... ......do.............. 8, 18
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458.71875.......................... ......do.............. 8, 20
458.7375........................... ......do.............. 23
458.750............................ ......do.............. 8
458.75625.......................... ......do.............. 8, 20
458.76250.......................... ......do.............. 8, 18
458.76875.......................... ......do.............. 8, 20
458.7875........................... ......do.............. 23
458.800............................ ......do.............. 8
458.80625.......................... ......do.............. 8, 20
458.81250.......................... ......do.............. 8, 18
458.81875.......................... ......do.............. 8, 20
458.8375........................... ......do.............. 23
458.850............................ ......do.............. 8
458.85625.......................... ......do.............. 8, 20
458.86250.......................... ......do.............. 8, 18
458.86875.......................... ......do.............. 8, 20
458.8875........................... ......do.............. 23
458.900............................ ......do.............. 8
458.90625.......................... ......do.............. 8, 20
458.91250.......................... ......do.............. 8, 18
458.91875.......................... ......do.............. 8, 20
458.9375........................... ......do.............. 23
458.950............................ ......do.............. 8
458.95625.......................... ......do.............. 8, 20
458.96250.......................... ......do.............. 8, 18
458.96875.......................... ......do.............. 8, 20
470-512............................ Base or mobile........ 9
806-824............................ Mobile................ 10
851-869............................ Base or mobile........ 10
928 and above...................... Operational-fixed..... 11
929-930............................ Base only............. 16
1427-1435.......................... Operational fixed, 12
base or mobile.
2450-2500.......................... Base or mobile........ 13
10,550 to 10,680*.................. ......do.............. ...........
------------------------------------------------------------------------
* The frequencies in the band 10.55-10.68 GHz are available for Digital
Termination Systems and for associated internodal links in the Point-
to-Point Microwave Radio Service. No new licenses will be issued under
this subpart but current licenses will be renewed.
(c) Explanation of assignment limitations appearing in the frequency
table of paragraph (b) of this section:
(1) This frequency is shared with the Special Emergency Radio
Service.
(2) This frequency will be assigned only in accordance with a
geographical assignment plan and is reserved primarily for assignment to
Highway Maintenance systems operated by states. The use of this
frequency by other Highway maintenance licensees will be authorized only
where such use is necessary to coordinate activities with the particular
state to which the frequency is assigned. Any request for such use must
be supported by a statement from the state concerned.
(3) The frequencies available for use at operational fixed stations
in the band 72-76 MHz are listed in Sec. 90.257(a)(1). These
frequencies, are shared with other services and are available only in
accordance with the provisions of Sec. 90.257.
(4) This frequency is not available for assignment to stations in
the Highway Maintenance Radio Service located in Puerto Rico and the
Virgin Islands.
(5) This frequency is reserved for assignment for use in highway
maintenance systems operated by licenses other than States.
(6) This frequency is only assigned to Highway Maintenance stations
licensed for its use prior to April 28, 1952. Such use may continue on a
secondary basis to any government or non-government radio operation.
(7) The requirements for secondary fixed use of frequencies in this
band are set forth in Sec. 90.261.
(8) This frequency is available in this service on a shared basis
with all other Public-Safety Radio Services.
(9) Subpart L contains rules for assignment of frequencies in the
470-512 MHz band.
(10) Subpart S contains rules for assignment of frequencies in the
806-824 MHz and 851-869 MHz bands.
(11) Assignment of frequencies above 928 MHz for operational-fixed
stations is governed by part 94 of this chapter.
(12) This frequency band is available to stations in this service
subject to the provisions of Sec. 90.259.
(13) Available only on a shared basis with stations in other
services, and subject to no protection from interference due to the
operation of industrial, scientific, or medical (ISM) devices. In the
2483.5-2500 MHz band, no applications for new or modification to
existing stations to increase the number of transmitters will be
accepted. Existing licensees as of July 25, 1985, or on a subsequent
date following as a result of submitting an application for license on
or before July 25, 1985, are grandfathered and their operation is co-
primary with the Radiodetermination Satellite Service.
(14) This frequency may not be assigned within 161 km (100 miles) of
New Orleans (coordinates 29-56-53 N and 90-04-10 W).
(15) Frequencies in this band will be assigned for low power
wireless microphones in accordance with the provisions of Sec. 90.265.
(16) Frequencies in this band are available only for one-way paging
operations in accordance with Sec. 90.494.
(17) Notwithstanding the provisions of limitation (2) above, this
frequency may be used by licensees in any of the Public Safety Radio
Services without a separate license for the purpose of operating self-
powered vehicle detectors for traffic control and safety purposes, on a
secondary basis, in accordance with Sec. 90.269 of this chapter.
(18) This frequency is not available in the 150-170 MHz band until
August 18, 1996. This frequency will be assigned with an authorized
bandwidth not to exceed 11.25 kHz. In the 450-470 MHz band, secondary
telemetry operations pursuant to Sec. 90.238(e) will be authorized on
this frequency.
(19) Subpart T contains rules for assignment of frequencies in the
220-222 MHz band.
(20) This frequency is not available until August 18, 1996. After
August 18, 1996 this frequency will be assigned with an authorized
bandwidth not to exceed 6 kHz.
(21) Assignment of frequencies in this band are subject to the
provisions of Sec. 90.173.
(22) This frequency will be authorized a channel bandwidth of 25
kHz.
[[Page 295]]
(23) This frequency is available for systems first licensed prior to
August 18, 1995. No new systems will be authorized after August 18,
1995, but prior authorized systems may be modified, expanded, and
renewed.
(24) Licensees as of August 18, 1995 who operate systems that are
2.5 kHz removed from regularly assignable frequencies may continue to
operate on a secondary, non-interference basis after August 1, 2003.
(d) Additional frequencies available. In addition to the frequencies
shown in the frequency table of this section, the following frequencies
are available in this service. (See also Sec. 90.253.)
(1) [Reserved]
(2) The frequency bands 31.99 to 32.00 MHz, 33.00 to 33.01 MHz,
33.00 to 33.01 MHz, 33.99 to 34.00 MHz, 37.93 to 38.00 39.00 to 39.01
MHz, 39.99 to 40.00 MHz and 42.00 to 42.01 MHz are available for
assignment for developmental operation subject to the provisions of
subpart Q.
(3) Frequencies in the band 73.0-74.6 MHz may be assigned to
stations authorized their use on or before December 1, 1961, but no new
stations will be authorized in this band, nor will expansion of existing
systems be permitted. (See also Sec. 90.257.)
(4) Frequencies in the 421-430 MHz band are available in the
Detroit, Cleveland, and Buffalo areas in accordance with the rules in
Secs. 90.273 through 90.281.
(e) Limitation on number of frequencies assignable. Normally only
two frequencies or pairs of frequencies in the paired frequency mode of
operation, will be assigned for mobile service operations by a single
applicant in a given area. The assignment of an additional frequency or
pair of frequencies will be made only upon a satisfactory showing of
need, except that:
(1) Additional frequencies above 25 MHz may be assigned in
connection with the operation of mobile repeaters in accordance with
Sec. 90.247, notwithstanding this limitation.
(2) Frequencies in the 25-50 MHz, 150-170 MHz, 450-512 MHz and 902-
928 MHz bands may be assigned for the operation of Location and
Monitoring Service (LMS) systems in accordance with the provisions of
subpart M of this part, notwithstanding this limitation.
(3) A licensee of a radio station in this service may operate radio
units for the purpose of determining distance, direction, speed, or
position by means of a radiolocation device on any frequency available
for radiolocation purposes without specific authorization from the
Commission, provided type accepted equipment or equipment authorized
pursuant to Sec. 90.203(b)(4) and (5) is used and all other rule
requirements are satisfied.
(Secs. 4(i) and 303(r), Communications Act of 1934, as amended,
Secs. 0.131 and 0.331 of the Commission's Rules and 5 U.S.C. 553
(b)(3)(B) and (d)(3); 47 U.S.C. 154(i) and )
[43 303 FR 54791 , Nov. 22, 1978]
Editorial Note: For Federal Register citations affecting
Sec. 90.23, see the List of CFR Sections Affected in the Finding Aids
section of this volume.
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