{"id":4641,"date":"2026-10-16T01:28:11","date_gmt":"2026-10-16T08:28:11","guid":{"rendered":"https:\/\/www.stickerquicker.com\/blog\/california-windshield-mounting-law\/uncategorized\/"},"modified":"2026-10-16T01:28:11","modified_gmt":"2026-10-16T08:28:11","slug":"california-windshield-mounting-law","status":"publish","type":"post","link":"https:\/\/www.stickerquicker.com\/blog\/california-windshield-mounting-law\/vehicle-updates\/","title":{"rendered":"California Windshield Law: What You Can Mount Where"},"content":{"rendered":"

California Windshield Law: What You Can Mount Where<\/h1>\n

Mo G<\/p>\n

Last verified: October 16, 2026<\/p>\n

Here is a very California scene. You are at a stoplight on Mission Boulevard with a phone mount stuck dead center on the glass, a toll tag above the mirror, a dash cam behind it, and something small and piney swinging from the rearview. Three of those four have a published rule. One of them does not belong there at all.<\/p>\n

The short version:<\/strong> California does not measure your windshield in opinions. It measures it in inches. The DMV driver handbook allows a 7 inch square in the lower corner on the passenger side, a 5 inch square in the lower corner of the driver’s side window, and a 5 inch square in the top center of the windshield for an electronic toll device. Everything else that blocks your view is a ticket.<\/p>\n

The squares, by the inch<\/h2>\n

California’s driver handbook, last modified April 13, 2026, is unusually specific about this. It tells you not to put signs or other objects on the front windshield or the side rear windows where they block your view, and then it names the exact exceptions.<\/p>\n\n\n\n\n\n\n\n\n
Where<\/th>\nMaximum size<\/th>\nWhat usually goes there<\/th>\n<\/tr>\n<\/thead>\n
Lower corner, passenger side windshield (or the lower corner of the rear window)<\/td>\n7 inch square<\/td>\nPhone mount, dash cam, suction mounted GPS<\/td>\n<\/tr>\n
Lower corner, driver’s side window<\/td>\n5 inch square<\/td>\nPhone mount on the door glass<\/td>\n<\/tr>\n
Center uppermost portion of the windshield<\/td>\n5 inch square<\/td>\nElectronic toll payment device, such as a FasTrak transponder<\/td>\n<\/tr>\n
Side windows behind the driver<\/td>\nNo square specified<\/td>\nStickers, shades, decals<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Read that table twice and one asymmetry jumps out. The passenger side allowance is on the windshield<\/em>. The driver’s side allowance, as the state writes it for drivers, is on the window<\/em>, meaning the door glass. People shopping for a phone mount almost always assume the two sides mirror each other. According to California’s own handbook, they do not.<\/p>\n

The mirror is the sentence everyone skips<\/h3>\n

One line in that handbook section is five words long: do not hang objects on the mirror. Air fresheners, graduation tassels, fuzzy dice, lanyards, the little cardboard tree. California names the rearview mirror directly, and there is no inch allowance attached to it. If something dangles there, it is in the one spot the handbook calls out by name.<\/p>\n

Commercial trucks got a brand new rule this year<\/h2>\n

This is the part nobody has written about, and it is genuinely new. A California Highway Patrol informational bulletin dated March 24, 2026<\/strong> explains that effective January 1, 2026<\/strong>, Vehicle Code section 26708 was amended to allow vehicle safety technology devices to be mounted inside the windshield of commercial vehicles listed in Vehicle Code section 34500 and subject to section 34500.7, as long as the mounting complies with the federal standard at 49 CFR 393.60.<\/p>\n

That federal standard measures space differently than the DMV handbook does. Instead of corner squares, it defines a band relative to the wiper swept area:<\/p>\n