Massachusetts Dash Cam Rules: Windshield Mounting Allowed, Audio Is the Trap

No provision of G.L. c. 90 mentions a dash camera, an event data recorder mounted by an owner, or a windshield camera. The rules that govern one have to be read out of three places, and they point in different directions.

The permission comes first. G.L. c. 90, section 13B(a), the hands-free law, prohibits an operator from holding a mobile electronic device or using one other than in hands-free mode, and prohibits reading or viewing text, images or video displayed on such a device. It then carves out a navigation map viewed on a device that is mounted on or affixed to a vehicle windshield, dashboard or centre console in a manner that does not impede the operation of the motor vehicle. The Legislature therefore contemplated devices fixed to the windshield and set the condition on them: not that they sit in a defined zone measured in inches, but that they do not impede operation. A dash camera mounted behind the mirror, out of the swept area, satisfies that condition. Note also that section 13B(a) says an operator is not considered to be operating if the vehicle is stationary and not in a part of the public way intended for travel, which is when reviewing footage becomes lawful.

The restrictions come from two older sections. G.L. c. 90, section 13 forbids an operator from permitting anything on or in the vehicle, or on or about his person, that may interfere with or impede the proper operation of the vehicle or its controls, and separately forbids driving a vehicle equipped with any television viewer, screen or other means of visually receiving a television broadcast located forward of the back of the driver seat or visible to the driver. That second prohibition is drawn around receiving a broadcast, so a record-only camera with no live display never reaches it, and a camera with a screen that faces away from the driver does not either. G.L. c. 90, section 9D(1) then forbids a sign, poster or sticker on the windshield or the front or rear side windows placed so as to obstruct, impede or distort the vision of the operator. A camera body is not a sign, poster or sticker, but an adhesive mount pad and any decal that comes with it are.

The inspection lane draws the practical line. Under 540 CMR 4.05(14)(m)2., a vehicle is rejected for an object extending more than three inches within the perimeter of the exposed windshield glass, and for a poster, sticker or decal attached to the windshield so as to obstruct the vision of the operator. The same regulation defines the Windshield Critical Viewing Area as the area covered by the sweep of the wipers, excluding the outer two inches. A dash camera tucked against the headliner behind the rear-view mirror stays clear of all three tests.

The audio side is where Massachusetts differs sharply from most states. G.L. c. 272, section 99 makes it an interception to secretly hear or secretly record the contents of any wire or oral communication through an intercepting device, unless every party has given prior authority. A dash camera that records cabin audio while a passenger, a rideshare rider or a mechanic talks, without their knowledge, meets that definition on its face. The offence carries a fine of up to $10,000 or up to five years in state prison. Recording the road with the microphone disabled avoids the section entirely, because there is no oral communication being recorded. If cabin audio is wanted, the practical route in the Commonwealth is a visible notice and the passengers' knowledge, since section 99 turns on secrecy rather than on the mere absence of a signed consent.

There is no dash camera offence, so a driver is exposed through the surrounding provisions. Reading or viewing video on a mounted device while driving is a section 13B violation, punishable by $100 for a first offence, $250 for a second and $500 for a third or subsequent, with a Registrar-selected distracted driving programme required after a second or subsequent offence under section 13B or section 8M. c. 175, section 113B; a third is. Section 13B(d) also states plainly that nothing in it authorises the seizure or forfeiture of the device.

c. 90, section 9D carries a fine of up to $250 and, on a third conviction, a Registrar licence suspension of up to 90 days. , corrected by relocating the mount and re-presenting the vehicle. c. 272, section 99(C)(1) makes a wilful interception punishable by a fine of not more than $10,000, up to five years in state prison, or up to two and a half years in a house of correction.