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.

Parking is already tight in San Francisco. As of Monday, it got a bit tighter as the city implemented a new state law aimed at protecting pedestrians in crosswalks.

Vehicles are prohibited from parking within 20 feet of a crosswalk as part of the city’s Vision Zero efforts to eliminate traffic deaths and make roads safer.