What is the maximum distance you may travel in a center left-turn lane before completing your left-hand turn?

The 100-foot rule is the signaling distance for a turn on city streets, not the maximum travel distance in a center turn lane. This answer reflects the everyday habit of pairing every turn with the 100-foot signal, so that number surfaces first whenever a turn-and-feet question appears.

300 feet is the signaling distance for turns on open highways, not the center-turn-lane limit. This answer recalls the highway-turn signal drilled alongside the 100-foot city version, so 300 comes to mind whenever a road-distance question involves turning.

500 feet is the U-turn visibility requirement near a grade and the low-beam changeover distance, not the center-turn-lane limit. This answer grabs the manual's most-cited round number when the real figure has slipped, since 500-foot rules appear in both headlight and U-turn sections.