Police in South San Francisco issued more than 200 citations to motorists in April for distracted driving infractions.
The citations came during Distracted Driving Awareness Month, an annual month-long campaign focusing on unsafe moving violations connected to distracted driving, police said.
In all, police issued 222 distracted driving citations.
Police said the citation most commonly issued to drivers during the campaign was for using a cellphone without it being hands-free.
Adult drivers are prohibited from driving while holding a cellphone in their hand but are able to use cellphones in a hands-free manner, police said.
Drivers under the age of 18 are prohibited from using a cellphone at any time.
A 2016 survey showed more than 44 percent of Californians said texting while driving is the most serious distraction for drivers, and 54 percent of Californians said they had been hit or nearly hit by a driver who was talking or texting on a cellphone, according to the National Highway Traffic Safety Administration and the California Office of Traffic Safety.