San Franciscans who park their cars within 20 feet of a crosswalk began receiving "written warnings" this week as city crews prepare to enforce California's "daylighting" law. Why it matters: The goal is to reduce traffic-related deaths and injuries by making it easier for drivers to see people crossing the street.

Starting Monday, the SFMTA will begin issuing warnings for vehicles that are parked within 20 feet of a crosswalk in the direction of approaching traffic.