Guide Signs: Route Markers, Destinations, Distances, Exits, and Services
Guide signs help you navigate rather than regulate or warn. On the Missouri exam, expect questions on sign color, route-marker shape, exit information, and the meaning of destination and distance signs. Green is the main guide-sign background; blue marks services and brown marks recreation or cultural sites.
Core rules
- Green signs give destinations, distances, exits, and lane assignments. A sign reading "EXIT 58 - 1 MILE" tells you the exit is one mile ahead, not that you are at it.
- Exit signs may show an exit number, destination, and an exit-only lane arrow. If you miss an exit, continue to the next one; do not reverse or stop on the shoulder.
- Route markers identify the road class. Interstate markers are red and blue shields; U.S. routes are white shield shapes; Missouri state routes are white markers with black lettering.
- Mile markers are small green signs with white numbers. They help you give a location in an emergency and judge distance to an exit.
- Service signs are blue and show gas, food, lodging, or hospital availability. A blue sign does not guarantee that a business is open 24 hours.
Worked example
A driver sees a green sign reading "EXIT 58 - 1 MILE" and wants that exit. The driver should check mirrors, signal, and move right after the sign, not brake sharply in the travel lane. The exit is still a mile away; early lane position prevents a last-second lane change.
Traps
Do not confuse an exit number with a mile marker, though they often match. A destination sign lists places ahead, not necessarily the next immediate turn. A blue service sign is not a regulatory sign and does not require a stop.