Section 24952 Of Article 5. Signal Lamps And Devices From California Vehicle Code >> Division 12. >> Chapter 2. >> Article 5.

. A lamp-type turn signal shall be plainly visible and understandable in normal sunlight and at nighttime from a distance of at least 300 feet to the front and rear of the vehicle, except that turn signal lamps on vehicles of a size required to be equipped with clearance lamps shall be visible from a distance of 500 feet during such times.