Guide and Informational Signs: Routes, Destinations, and Services
What this domain tests
Guide signs help you navigate rather than command a maneuver. The exam asks you to distinguish destination and distance signs, service and recreation signs, route markers, exit information, and mile markers.
Core rules
- Green guide signs show destinations, directions, distances, and exits. Read the exit number and destination before the interchange, not in the gore area.
- Blue signs show motorist services such as fuel, food, lodging, and hospitals. They are informational, not regulatory.
- Brown signs show recreation and cultural areas.
- Route markers identify the road type: Interstate, U.S. route, or Ohio state route. The shield or marker shape and legend help you distinguish them; the number alone is not enough.
- Mile markers are small green signs along many highways. They give a location reference for distances and emergencies; they are not exit numbers unless the exit numbering system matches.
Worked example
A green sign reads Exit 17 - SR 161 EAST, and a nearby mile marker reads 17. The exit number identifies the interchange; the mile marker identifies your position along the highway. The driver should use the exit sign for the destination and the mile marker only as a location reference.
Traps that cost marks
- Treating a blue service sign as a law or a guarantee that the service is at the next exit.
- Confusing a route marker with a warning or regulatory sign.
- Assuming every exit number equals the mile marker.
- Waiting until the exit gore to read a destination sign.
- Ignoring the route type when two roads have similar numbers.