Listed below are subject terms currently being used by the Department of Transportation along with their corresponding file code number.
| American Automobile Association |
183 |
| American Association of State Highway and Transportation Officials |
160 |
| Accident Review |
1180 |
| Adams County |
1 |
| Adjutant General |
220 |
| Administrative Code |
234 |
| Advertising Sign |
1160 |
| Additions: County Highways |
109 |
| Additions: State Highways |
1108 |
| Advisory Research Committee |
1600 |
| Aerial Photographs |
677 |
| Aeronautics Commission |
677.1 |
| Air Pollution |
1198 |
| Airport Locations |
2512 |
| Alabama State Highway Department |
101 |
| Alaska Department of Highways |
100 |
| American Association of Engineers |
182 |
| American Concrete Institute |
190 |
| American Institute of Steel Construction |
700 |
| American Road Builders Association (ARBA) |
180 |
| American Society of Civil Engineers |
185 |
| American Society for Testing Materials |
184 |
| Annual: Highway, Conference |
1360 |
| Annual: Report (FHWA) |
149 |
| Arterial Highway |
1191 |
| Archaeological Salvage |
550 |
| Arizona Highway Department |
103 |
| Ashland County |
2 |
| Asphalt |
915 |
| Asphalt Paving Technologists Association |
192 |
| Associated General Contractors of America |
188 |
| Associated Hospital Service Inc. |
2536 |
| Associated Outdoor Advertising of Wisconsin |
270 |
| Association of Asphalt Paving Technologists |
192 |
| Atomic Energy Commission |
165 |
| Attorney General |
202 |
| Audits, Construction Costs |
149 |
| Accidents, Automobile |
1180 |
| Accident Reports |
1181 |
| Barron County |
3 |
| Bayfield County |
4 |
| Biennial Report |
2520 |
| Bikeways |
1210 |
| Bills, Legislative |
232 |
| Bituminous Pavement |
915 |
| Bond Issues |
300 |
| Bridges |
700-799 (by county, e.g., Adams County 701) |
| Brown County |
5 |
| Budgets: Department of Budget and Accounts |
217.1 |
| Budgets: Program |
240 |
| Buffalo County |
6 |
| Bureau of Census |
154 |
| Bureau of Engineering |
217 |
| Bureau of Internal Revenue |
148 |
| Bureau of Personnel |
212 |
| Bureau of Purchasing |
219 |
| Burnett County |
7 |
| Calcium Chloride |
916 |
| California Division of Highways |
104 |
| Calumet County |
8 |
| Centerline Marking |
1134 |
| Chippewa County |
9 |
| Circulars, Letters |
1510 |
| Civil Defense |
194 |
| Clark County |
10 |
| Classification: Account |
2535 |
| Classification: Contractor |
510 |
| Colorado Department of Highways |
105 |
| Columbia County |
11 |
| Concrete: Plant |
580 |
| Concrete: Pavement Joint |
574 |
| Connecticut State Highway Department |
106 |
| Connecting Highways |
952 |
| Conservation Commission (DNR) |
206 |
| Construction |
500-580 |
| Construction: Conferences |
558 |
| Construction: Programs (Federal and State) |
550 |
| Consulting Engineer |
1340 |
| Controlled Access Highway |
561 |
| Corps of Engineers, U.S. Army |
158 |
| County: Highway, Aids: Townships |
2535 |
| County: Highway, Aids: Changes |
400-473 (by county) |
| County: Board Resolutions |
552 |
| County Highway System |
1109 |
| Crawford County |
12 |
| Dane County |
13 |
| Delaware State Highway Department |
107 |
| Department of Administration |
237 |
| Department of Agriculture and Markets |
208 |
| Department of Budget and Account: Fiscal, Note |
221 |
| DILHR |
205 |
| Department of Justice |
202 |
| Detours |
1189 |
| Divided Highway Task Force |
250 |
| Division of Industrial Development |
211 |
| Dodge County |
14 |
| Door County |
15 |
| Douglas County |
16 |
| Drainage Conditions |
911 |
| Dunn County |
17 |
| Easements |
679 |
| Eau Claire County |
18 |
| Emergency |
194 |
| Emergency: Relief fund |
555 |
| Engineering Society of Wisconsin |
271 |
| Engineering Services |
1340 |
| Environmental Awareness Center |
240 |
| Equal Employment Opportunity |
2526 |
| Equestrian Trails |
1210 |
| Farm Numbering |
1161 |
| Federal Aid System |
556 |
| Federal Aid System: Primary Program |
550 |
| Federal Aid System: Primary System (Federal Aid Highway System) |
1105 |
| Federal Aid System: Report-Department of Administration |
237 |
| Federal Aid System: Road Act |
153.1 |
| Federal Aid System: Secondary Highway Fund |
2535 |
| Federal Aid System: Urban Funds |
557 |
| Federal Highway Administration (FHWA) |
153.1 |
| FHWA, Region #5 |
149 |
| Forest County |
21 |
| Forest Highways |
161 |
| Freeways |
1103 |
| Gasoline Tax |
2507 |
| Georgia State Highway Department |
109 |
| Governor |
211 |
| Grade Crossings |
1400 |
| Grant County |
22 |
| Gravel Pits |
1697 |
| Great River Road Assn. |
164 |
| Green County |
23 |
| Green Lake County |
24 |
| Grooves, Concrete |
1197 |
| Guard Rails |
572 |
| Hawaii |
100 |
| Highway: Access, Controlled |
561 |
| Highway: Advisory Board |
230 |
| Highway: Beautification |
1205B |
| Highway: Bonding |
550 |
| Highway: Commission |
240 |
| Highway: Condition |
653 |
| Highway: Controlled Access |
561 |
| Highway: Construction |
558-580 |
| Highway: Design Costs |
674 |
| Highway: Drainage: Conference |
149 |
| Highway: Forest |
161 |
| Highway: Fund |
2535 |
| Highway: Impact study |
235 |
| Highway: Improvement Program |
2504 |
| Highway: Law |
1194 |
| Highway: Lighting: Permit |
1136 |
| Highway: Rerouting |
1106 |
| Highway: Research Correlation Service |
170 |
| Highway: Research Board |
170 |
| Highway District 1 |
91 |
| Highway District 2 |
92 |
| Highway District 3 |
93 |
| Highway District 4 |
94 |
| Highway District 5 |
95 |
| Highway District 6 |
96 |
| Highway District 7 |
97 |
| Highway District 8 |
98 |
| Highway Engineering Exchange Program (HEEP) |
673 |
| Historical markers |
1205H |
| Hot Mix |
915 |
| Highway Planning Survey |
149 |
| Ice Prevention (winter maintenance) |
1000 |
| Idaho Department of Highways |
110 |
| Illinois Division of Highways |
111 |
| Indiana State Highway Department |
112 |
| Indian Reservations |
157 |
| Industrial Commission |
205 |
| Institutional Roads |
2537 |
| Institute of Traffic Engineers |
187 |
| Insurance Commission |
213 |
| Insurance Institute of Highway Safety |
1197 |
| Interchange Lighting |
1136 |
| Internal Revenue Service |
148 |
| Interstate Commerce Commission |
1190 |
| Interstate: Highways |
1107 |
| Interstate: Maintenance |
900 |
| Iowa County |
25 |
| Iowa State Highway Commission |
113 |
| Iron County |
26 |
| Jackson County |
27 |
| Jefferson County |
28 |
| Juneau County |
29 |
| Kansas State Highway Commission |
114 |
| Kenosha County |
30 |
| Kentucky Department of Highways |
115 |
| Kewaunee County |
31 |
| La Crosse County |
32 |
| Lafayette County |
33 |
| Langlade County |
34 |
| Lake Access (access to navigable road) |
2518 |
| Land Economic, Study |
679 |
| Landscaping Fund |
2535 |
| Legislative Council |
230 |
| Lincoln County |
35 |
| Louisiana Department of Highways |
116 |
| Maine State Highway Commission |
117 |
| Maintenance |
900-1000 |
| Maintenance: Agreements |
980 |
| Maintenance: Funds |
930-940 |
| Maintenance: Machinery |
978-979 |
| Management Advisory Service |
240 |
| Manitowoc County |
36 |
| Maps: Construction |
900 |
| Maps: Highway Classification |
1192 |
| Maps: Topographic |
600 |
| Marathon County |
37 |
| Marinette County |
38 |
| Markers: Monument |
575 |
| Markers: Right of way |
575 |
| Marking: Centerline |
1134 |
| Marking: Paint |
1131 |
| Marking: Signing: Equipment (Median Island Light) |
1131 |
| Marking: Signing: Manual |
1110 |
| Marking: Signing: One-Way Street |
1110 |
| Marking: Signing: State Line, Welcome |
1110 |
| Marquette County |
39 |
| Maryland State Roads Commission |
118 |
| Massachusetts Department of Public Works |
119 |
| Mass, Transit |
557-1 |
| Materials |
1600-1799 |
| Memorial Highways |
1207 |
| Menominee County |
73 |
| Merrimac Ferry |
259 |
| Metric Conversion |
1341 |
| Michigan Department of Highways |
120 |
| Mileage |
950 |
| Mileposts |
1131 |
| Milwaukee County |
40 |
| Minnesota Department of Highways |
121 |
| Minutes, Highway Commission |
261 |
| Mississippi State Highway Department |
122 |
| Mississippi River Parkway (Great River Road) |
164 |
| Mississippi Valley Conference |
189 |
| Missouri State Highway Commission |
123 |
| Monroe County |
41 |
| Montana Department of Highways |
124 |
| National Academy of Sciences |
170 |
| National Bituminous Concrete Association |
2500 |
| National Conference on Street and Highway Safety |
181 |
| National Highway Management Conference |
195 |
| National Highway Users Conference |
197 |
| National Research Council |
181 |
| National Society of Professional Engineers |
273 |
| Natural Resources Committee of State Agencies |
1206 |
| Nebraska Department of Roads |
125 |
| Nevada Department of Highways |
126 |
| New Hampshire Department of Highways |
127 |
| New Jersey State Department of Transportation |
128 |
| New Mexico State Highway Department |
129 |
| New York Department of Transportation |
130 |
| Noise |
1198 |
| No passing zones |
1134 |
| North Carolina State Highway Commission |
131 |
| North Dakota State Highway Department |
132 |
| Northern Great Lakes Area Council |
193 |
| Notices, Public Hearing: State Highway change |
400 plus county |
| Notices, Public Hearing: Freeway |
1103 |
| Notices, Public Hearing: Interstate |
1107 |
| Nuclear Study |
165 |
| Oconto County |
42 |
| Off Street Parking |
1190 |
| Ohio Department of Highways |
133 |
| Oklahoma Department of Highways |
134 |
| One-Way Streets |
1190 |
| Oneida County |
43 |
| ORAP, Outdoor Recreation Act Program, Governor's Commission |
211 |
| Oregon State Highway Department |
135 |
| Outagamie County |
44 |
| Ozaukee County |
45 |
| Parking: Regulation |
1190 |
| Parking: Zone |
1134 |
| Pavement Marking |
1134 |
| Pennsylvania Department of Highways |
136 |
| Pepin County |
46 |
| Pierce County |
47 |
| Pilot Studies |
153.1 |
| Planning Program |
550 |
| Policy Memoranda |
240 |
| Polk County |
48 |
| Pollution |
1198 |
| Portage County |
49 |
| Portland Cement Association |
186 |
| Price County |
50 |
| Project Closing |
217.1 |
| Public Information |
250-259 |
| Public Service Commission |
215 |
| Racine County |
51 |
| Radar |
1110 |
| Ready Mix Plants |
558 |
| Regional Planning |
1206 |
| Research Advisory Committee |
1600R |
| Rhode Island Department of Public Works |
137 |
| Richland County |
52 |
| Right of Way |
679 |
| Road Beautification |
1205B |
| Road School |
1360 |
| Rocks |
53 |
| Rural Roads: Inventory |
149 |
| Rural Roads: Numbering, System |
1161 |
| Rusk County |
54 |
| Rustic Road |
1207 |
| Safety Campaign |
1197 |
| St. Croix County |
55 |
| Salt |
916 |
| Sauk County |
56 |
| Sawyer County |
57 |
| Scenic Easements |
1207 |
| Seat Belts |
1197-1 |
| Secondary Road Plans |
556.1 |
| Secretary of State |
216 |
| SEWPRC |
557.1 |
| Shawano County |
58 |
| Sheboygan County |
59 |
| Sign |
1110 |
| Snow: Fence |
990 |
| Snow: Removal |
1000 |
| Snowmobile Trails |
1210 |
| Sodium Chloride |
916 |
| South Carolina State Highway Department |
138 |
| South Dakota Department of Highways |
139 |
| Soil Reports |
1600 |
| Special Permits |
1195 |
| Speed: Check |
1179 |
| Speed: Limit |
1179 |
| Speed: Monitoring |
1179 |
| Speed: Study |
1179 |
| Speed: Zone |
1179 |
| State Highway Allotment Fund |
2535 |
| Statutes |
233 |
| Steel Inspection |
1691 |
| Taylor County |
60 |
| Tax: Commission |
207 |
| Tax: Gasoline |
2507 |
| Tennessee Department of Highways |
140 |
| Texas State Highway Department |
141 |
| Town: Highways |
2502 |
| Town: Plats |
670 |
| Tourist Information |
1205W |
| Traffic |
1100 |
| Traffic: Census |
1170 |
| Traffic: Control: Signal |
1110 |
| Traffic: Count |
1170 |
| Traffic: Detour |
1189 |
| Traffic: Information |
1150 |
| Traffic: Law |
1194 |
| Traffic: Manual |
1132 |
| Traffic: Paint |
1220 |
| Traffic: Regulation |
1190 |
| Traffic: Safety |
1197 |
| Traffic: Speed: Study, Computation |
1179 |
| Trailer Length |
1190 |
| Transportation Research Board |
170 |
| Transportation Seminars |
241 |
| Trempealeau County |
61 |
| University of Wisconsin (All Universities) |
235 |
| United States: Army Corps of Engineers |
158 |
| United States: Bureau of Mines and Standards |
156 |
| United States: Coast Guard |
155 |
| United States: Department of Commerce |
154 |
| United States: Department of Agriculture |
153 |
| United States: Department of Labor |
156 |
| United States: Department of Interior |
157 |
| United States: Department of Labor: Notice of Modification |
2526 |
| United States: Geological Survey Map |
157 |
| United States: Highway System |
1107 |
| United States: Post Office Department |
159 |
| United States: Treasury Department |
148 |
| Urban Planning |
557-1 |
| Utah State Department of Highways |
142 |
| Vermont Department of Highways |
143 |
| Vernon County |
62 |
| Vilas County |
63 |
| Virginia Department of Highways |
144 |
| Washington Department of Highways |
145 |
| Walworth County |
64 |
| Washburn County |
65 |
| Washington County |
66 |
| Watersheds |
1206 |
| Waukesha County |
67 |
| Waupaca County |
68 |
| Waushara County |
69 |
| Weight Limitation Restrictions |
1193 |
| Weight Station |
1193-1 |
| West Virginia State Road Commission |
146 |
| Winnebago County |
70 |
| Wisconsin County Board Association |
2506 |
| Wisconsin Council of Safety |
272 |
| Wisconsin Emergency Plan |
194 |
| Wisconsin Good Roads Association |
2506 |
| Wisconsin Highway Users Conference |
274 |
| Wisconsin Industrial Development Division |
205 |
| Wisconsin Society of Professional Engineers |
273 |
| Wisconsin State Patrol |
2543 |
| Wood County |
71 |
| Wyoming Highway Department |
147 |
