Dash Cam Buying and Fitting Basics
A dash cam is cheap insurance for the one drive in ten thousand that goes wrong. Here is what the spec sheet actually means, and how to fit one so it works and stays legal.
The specs that matter: real 1440p or good 1080p, a capacitor rather than a battery for heat tolerance, reliable loop recording with G-sensor lock, and a mount position behind the mirror that stays out of your view. Everything else is marketing.
Insurers, police and courts accept dash cam footage, which turns a your-word-against-theirs collision into an open-and-shut file. Getting the value is mostly about picking honest hardware and fitting it properly.
The specs that matter
Resolution sells cameras, but plate-readability at night is what matters, and that comes from the sensor and lens more than the pixel count: a good 1080p unit with a quality sensor beats a cheap 4K one. Look for a capacitor instead of a lithium battery, dashboards get hot and capacitors survive it; a G-sensor that locks the crash clip so loop recording cannot overwrite it; and buy the fastest-rated memory card the maker endorses, because worn cheap cards are the top cause of missing footage.
Front only or front and rear
A large share of disputed collisions are rear-enders, which a front camera never sees. Two-channel kits record both directions and cost little more; the rear unit wires along the headliner to the front one. For cars parked on the street, parking mode adds surveillance while you are away, but it needs a hardwire kit with battery protection so it cannot flatten the starter battery.
Fitting it right
Position is the legal half of the job: the camera belongs high on the windscreen behind the rear-view mirror, inside the area the wipers sweep but outside your direct view of the road. Route the cable up into the headliner, around the A-pillar trim and down to the 12V socket or fusebox; a plastic trim tool makes this a clean twenty-minute job. A hardwire kit frees the 12V socket and enables parking mode, and takes an auto-electrician minutes if fuseboxes are not your thing.
Using the footage
After an incident, lock or export the clip before it can be overwritten and note the time. Insurers accept footage directly and several police forces run online submission portals for dangerous driving. Privacy rules differ by country on what you may publish, faces and plates generally need blurring for public posting, but handing footage to police or your insurer is legitimate use everywhere. Check the dash cam legality page for your country for the fine print.
The conditions that matter
- ✓Capacitor power, honest sensors and endorsed memory cards make footage reliable.
- ✓Mount behind the mirror, in the wiped zone, out of your direct view.
- !Publishing identifiable footage has privacy rules; evidence use is fine everywhere.
Sources
These are the provisions the road-legality rules linked above rest on.
- MOT inspection manual: cars and passenger vehicles (GOV.UK)
- Road Vehicles (Construction and Use) Regulations 1986
General guidance only. Details vary by exact vehicle and change over time; confirm with a reputable specialist before modifying.