For traffic related concerns in the City of San Dimas, please complete a Traffic Investigation Request form. Request may be filled out online, saved and emailed to the Traffic Secretary (address below) or printed and submitted via mail or in person at San Dimas City Hall. Fax requests to (909) 394-6269. All requests are initially reviewed by the Public Works Director. If further investigation is recommended, the request will be reviewed by the Traffic Safety Committee in accordance to the procedures and schedule.