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Illinois Department of Transportation (IDOT) (IL)

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For information on IDOT District frequencies and talkgroups, see the Radioreference IDOT Database page.


  • "Lane 1" is the far left lane.

Road Condition Codes

  • Code 1: All Clear – Pavement is clear of ice and snow.
  • Code 2: Scattered – Scattered slick spots on pavements and bridge decks, or wet freezing pavements.
  • Code 3: 75% Bare – Pavement clear except for a narrow strip on the edge.
  • Code 4: 50% Bare – When a strip of ice or packed snow, some 4’ wide, remains in the center of the pavement with a 2’ to 3’ strip along each edge.
  • Code 5: 25% Bare – When there is a narrow strip of bare pavement from 6” to 2’ in each lane where the tires travel.
  • Code 6: Snow Covered – When the pavement on a route or portion of the District is covered with ice or packed snow.

Statewide - Contractors

  • Egizi Electric of Springfield is contracted to install/maintain most Traffic Signals in the District 6 & District 8 areas (know to work in Springfield, Carlinville, Litchfield, Glen Carbon)

Statewide Portable Frequencies - Unidentified uses and tones

  • WNZU567 453.4625, 458.4625 (11/16K Digital) at 40kmra Saline County
  • WNZU571 453.4625, 458.4625 (11/16K Digital) at 40kmra Jackson County
  • WPFU937 453.4625, 458.4625 (11/16K Digital) at 16kmra Massac County
  • WPFU938 453.4625, 458.4625 (11/16K Digital) at 16kmra Livingston County
  • WNUE273 453.4625, 458.4625 (11/16K Digital) at 40kmra Franklin County
  • WNUE262 453.4625, 458.4625 (11/16K Digital) at 40kmra Williamson County
  • KD39304 453.4625, 458.4625 (11/16K Digital) at 40kmra Sangamon County
  • KJK803 Statewide Temporary Fixed Bases on:
    • 47.0200, 47.0600, 47.1000, 47.1400, 47.1800, 47.2800, 47.3000, 47.3600, 47.3800 (20K)
    • 150.9950, 151.0400, 151.0700, 151.1300, 156.0450, 156.0600, 156.1200, 156.1350, 159.1800, 159.1950
47.0200 		KJK803 	B		IDOT/CMS 1 	Statewide Moveable Bases 	
453.3625 		WPGA913 	M		IDOT/CMS 2 	Statewide Portables 
	WPGA913 	M		IDOT/CMS 3 	Statewide Portables 	FM 	Public Works
453.5125 		WPGA913 	M		IDOT/CMS 4 	Statewide Portables 	
453.5375 		WPGA913 	M		IDOT/CMS 5 	Statewide Portables 	
453.6875 		WPGA913 	M		IDOT/CMS 6 	Statewide Portables 	
453.7125 		WPGA913 	M		IDOT/CMS 7 	Statewide Portables
453.7625 		WPGA913 	M		IDOT/CMS 8 	Statewide Portables 	
453.8875 		WPGA913 	M		IDOT/CMS 9 	Statewide Portables 
453.9125 		WPGA913 	M		IDOT/CMS 10 	Statewide Portables 
458.3625 		WPGA913 	M		IDOT/CMS 11 	Statewide Portables 
458.4625 		WPGA913 	M		IDOT/CMS 12 	Statewide Portables 
458.5125 		WPGA913 	M		IDOT/CMS 13 	Statewide Portables 
458.5375 		WPGA913 	M		IDOT/CMS 14 	Statewide Portables
458.6875 		WPGA913 	M		IDOT/CMS 15 	Statewide Portables 
458.7125 		WPGA913 	M		IDOT/CMS 16 	Statewide Portables 
458.7625 		WPGA913 	M		IDOT/CMS 17 	Statewide Portables 
458.8875 		WPGA913 	M		IDOT/CMS 18 	Statewide Portables 
458.9125 		WPGA913 	M		IDOT/CMS 19 	Statewide Portables 
155.0550 		KR5616 	M		IDOT/CMS 20 	IDOT/CMS: Statewide 	
155.9250 		KR5616 	M		IDOT/CMS 21 	IDOT/CMS: Statewide 	
453.0250 		KR5616 	M		IDOT/CMS 22 	IDOT/CMS: Statewide 	
453.3000 		KR5616 	M		IDOT/CMS 23 	IDOT/CMS: Statewide (N of I-70) 
453.3500 		KR5616 	M		IDOT/CMS 24 	IDOT/CMS: Statewide 	
453.6000 		KR5616 	M		IDOT/CMS 25 	IDOT/CMS: Statewide 	
453.6500 		KR5616 	M		IDOT/CMS 26 	IDOT/CMS: Statewide 	
453.8000 		KR5616 	M		IDOT/CMS 27 	IDOT/CMS: Statewide 	
453.8750 		KR5616 	M		IDOT/CMS 28 	IDOT/CMS: Statewide 	
453.9000 		KR5616 	M		IDOT/CMS 29 	IDOT/CMS: Statewide 	
458.3000 		KR5616 	M		IDOT/CMS 30 	IDOT/CMS: Statewide (N of I-70) 
458.3500 		KR5616 	M		IDOT/CMS 31 	IDOT/CMS: Statewide 	
458.6000 		KR5616 	M		IDOT/CMS 32 	IDOT/CMS: Statewide 	
458.6500 		KR5616 	M		IDOT/CMS 33 	IDOT/CMS: Statewide 	
458.8000 		KR5616 	M		IDOT/CMS 34 	IDOT/CMS: Statewide 	
458.8750 		KR5616 	M		IDOT/CMS 35 	IDOT/CMS: Statewide 	
458.9000 		KR5616 	M		IDOT/CMS 36 	IDOT/CMS: Statewide 	
458.9000 		KR5616 	M		IDOT/CMS 37 	IDOT/CMS: Statewide 	

Starcom21

Identified Talkgroups
Most districts in the state are using Starcom21 for their radio communications. Below is a map which shows the talkgroups used at the local IDOT yards throughout the state.
IDOT Yard Starcom21 Talkgroups Map - Click image to view in full
A closeup map of the Chicago Area yards:
IDOT Yard Starcom21 (District 1) Talkgroups Map - Click image to view in full

10/13 - McHenry Co. Primary, 453.4875, has been replaced by 453.6375 in a modification to callsign WQPX735. Please submit if this has been confirmed as in use.

[8/13 - need update] F1 (150.995) and F8 (453.4) are simulcast. Other channels can be patched as needed.

There is a shorthand way of referring to the expressways so that NW @ Harlem is understood as outbound JFK @ Harlem. NW & SE = JFK E & W = IKE NE & SW = I 55 N & S = Dan Ryan & Eedens and I 57 & Ford

IDOT Emergency Patrol Vehicle's carry both UHF and SC21 radios. UHF frequencies are primary and SC21 is used as fallback. (as of 8/13) Conventional P25 Radio IDs (RIDs)

  • 743, 744, 755, 772 on 453.1875 (6/23/15)
  • 369004 - dispatcher on 453.1875 (6/23/15)
  • 369007 - Communications Consoles Emergency Traffic Patrol (Dispatcher)
  • 369008 - Communications Consoles Emergency Traffic Patrol (Dispatcher)

District 1 - Schaumburg (Chicago Metro Area)

Radio Layout

IDOT D1 PORTABLE ZONE A LAYOUT

CH 1 McHenry PRI
CH 2 McHenry M2M
CH 3 McHenry SEC
CH 4 NORTH E. PRI
CH 5 NORTH E. M2M
CH 6 NORTH E. SEC
CH 7 KANE PRI
CH 8 KANE M2M
CH 9 KANE SEC
CH 10 CENTRAL PRI
CH 11 CENTRAL M2M
CH 12 CENTRAL SEC
CH 13 DOT D1 DET A
CH 14 DOT D1 DET B
CH 15 STATE WIDE
CH 16 DOT D1 WIDE

IDOT D1 PORTABLE ZONE B LAYOUT

CH 1 SOUTH PRI
CH 2 SOUTH M2M
CH 3 SOUTH SEC
CH 4 EXPYWAY PRI
CH 5 EXPYWAY M2M
CH 6 EXPYWAY SEC
CH 7 ETP PRI
CH 8 ETP M2M
CH 9 ETP SEC
CH 10 ADMIN PRI
CH 11 ADMIN M2M
CH 12 ADMIN SEC
CH 13 DOT D1 DET A
CH 14 DOT D1 DET B
CH 15 STATE WIDE
CH 16 DOT D1 WIDE


District 8

EPV Highway Codes


A -
B - 
C -
D - 
E -
F -
G -
H - I-55? (ESTL area?)

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