Urban expressways like shown are 35 to 50 MPH. I'm guessing that photo is a 35 MPH zone of San Antonio Rd passing over Central Expressway and Caltrain. Only a handful of downtown and residential streets are 25 MPH or less. Urban expressways forbid parking during business hours so that bicycle commuters traveling at 15 to 22 MPH rarely need to mix with traffic. I don't think a 25 MPH car is going to make many friends.