Vehicle blind spots, also known as blind zones, are areas around a vehicle that cannot be directly observed by the driver while at the controls. Every vehicle has blind spots, but their size and location vary dramatically depending on the vehicle type. Passenger cars typically have blind spots on both rear quarters, while larger vehicles like SUVs, trucks, and commercial vehicles have significantly larger blind zones that can completely obscure a cyclist from view. The 'A-pillar' blind spot—the structural support between the windshield and front door—is particularly dangerous during turns, as it can hide an entire cyclist approaching an intersection.
For cyclists, these blind spots create life-threatening situations daily. When a driver changes lanes without properly checking their blind spot, they may merge directly into a cyclist riding alongside them. When a truck driver makes a right turn without seeing a cyclist in their blind spot, the result is often a devastating 'right hook' collision. Large commercial vehicles present the greatest danger—a fully loaded semi-truck can have blind spots extending 20 feet in front, 30 feet behind, and spanning multiple lanes on either side. Studies show that truck accidents involving cyclists are disproportionately fatal due to the size disparity and the extensive blind zones these vehicles create. California Vehicle Code Section 22107 requires drivers to check for cyclists before turning or changing lanes, but tragically, many drivers fail to take this basic safety precaution.