From Wazeopedia

California/Major roads/Main

92 bytes added, 3 years ago
U-turns on *two-way* Primary Street through Major Highway type roads may be enabled in either of the following two circumstances:
*1) The U-turn is _explicitly_ allowed by signage; or
*2) The U-turn is otherwise legal and safe, and there is _at least_ 10.1 m (33 feet) from the left edge of the departure lane to the "destination" curb. This can include any median that may exist to the left of the departure lane. (The measurement is intended to accommodate the turning radius of most passenger vehicles.)
Do NOT make a point of enabling all U-turns valid under this guidance, only as you encounter them and they are necessary. Do not enable U-turns on Street type roads. This guidance could change in the future.