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To satisfy Alberta Canada Vehicle inspection requirements:
A machine designed for the purpose and specifically intended for the head lights being aimed may be used
Otherwise:
A grid painted or other wise permanently attached to a flat surface (Mine is a pre-printed paper glued to 1/8 plywood)
Then the Height of the head light is taken and the grid set up to show where the light shines with the center line at the same height as the head lights.
How I do it on the road for my cars and truck:
First find a wall you can point the car at.
Adjust both head lights so on low beam they point just slightly to the right of straight ahead.
Then adjust both so they drop about three inches in 20 feet. Since I don't bother with a tape measure, I eyeball the height until I think it is right.
Then I test drive, since I usually end up doing this on a trip on the road in the dark the test drive is either till I need gas next, or if I'm way out it just takes a minute on the shoulder or off ramp. Safety first!
So I am looking for the head lights to both be pointed down the road, the natural cone of the light following the centre line on the left and the pool of light to be obvious 10 car lengths or a little less in front.
The real test is High beam, This should throw its pool of light starting 5 or more car lengths down the road and straight ahead.
The natural cone of light should be straight ahead and the height of the head lights for as far as they reach.
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