There are multiple reasons to post MUTCD signs in specific locations, but each sign must ultimately fulfill a need, get attention, and deliver a simple message.

​Construction zones near roadways need plenty of orange or yellow signs to remind drivers to slow down for worker safety.

Many of traffic accidents occur on one way streets that lack sign visibility at intersections or at night. Wrong way signs help reduce these tragedies.

Visibility is the main concern for any sign posted on a highway. Without clear visibility from both a distance and close up, signs are useless.