How to judge distance when parking
Updated October 2026
You sit in the middle of the car, but you park its corners. To judge distance, don’t estimate: use reference points. Each car has a few places where something you can see, such as a line, a mirror edge or a pillar, tells you exactly where the bumper is.
These steps assume right-hand traffic, with the kerb on your right. If you drive on the left, swap every left and right.
Step by step
Find your front reference
From the seat you cannot see the ground just in front of the car; the bonnet hides it. Drive slowly up to a line and watch it disappear under the bonnet. The bumper is still some distance short of it. That is your front reference.
Find your side reference
Drive slowly along a line and note where it seems to reach the bonnet from your seat. When the line reaches that same point, it runs right under your wheel on that side.
Find your rear reference
Looking back through the rear window, the nearest few metres are hidden. Put a cone or a bag behind the car and see where it disappears from view.
Know your car’s size
Length, width and turning circle decide how much room you need. Every car is different, so learn yours.
Check, don’t guess
Combine references with mirrors and sensors. Use the sensors as a backup, not as the main view.
Common mistakes
- Judging by eye. The eye guesses badly on a sloping bonnet. Use fixed points.
- Changing cars without re-learning. A new car has new references. Spend a few minutes finding them.
- Forgetting the mirrors. The mirror edge is itself a reference: when the line reaches a particular point on the mirror, you know where the wheel is.
Tips that make it easier
- Park next to something painted, such as a lane line, to practise: it gives you a straight edge.
- Practise stopping with your wheel on the line, then your bumper on the line.
- Make a note for each car you drive, such as: line at the edge of the bonnet means the wheel is on the line.
In the driving test
Examiners cannot see your references, but they can see the result: a car that stops a consistent distance from the kerb or line, every time.
Quick answers
How do I know how close the car is to the kerb?
Use the kerb-side mirror, tilted down to show the kerb and the wheel, and a side reference.
Can I rely on parking sensors?
Use them as a backup. They have limits, for example with thin posts, low objects or narrow items.
How do I know how long my car is?
Look it up in the handbook, and in ParkingAim’s garage, which lists length, wheelbase and turning circle for each car.
Practise it in ParkingAim
The very first ParkingAim lesson, free, teaches your front reference with the bonnet hiding a line and the real distance revealed.
- Know Your Car: Front BumperLearn to stop 30 cm from a barrierFree
Park it for real, without the risk
ParkingAim is a parking trainer for iPhone, iPad and Mac. A calm instructor’s voice talks you through each move in a 3D city, sized to your car. Three lessons are free.
