Adjusting Headlight on a slope
Grand HDF Member
Joined: Jan 2012
Posts: 4,459
Likes: 2,895
From: Oklahoma
Yikes! All that math, all that running around. Son of the hounds has it right. If the incline of your driveway is constant, 34 inches above the surface at one end equals 34 inches above the surface at the other end. The only place for a little "slippage" is that the garage door is probably vertical. If your drive way has a 3 degree slant, the door will be at a 93 degree angle to the surface of the driveway, but for aiming a headlight, that is not significant.
If your driveway varies in incline from one end to the other, just find another location as that is much less complicated than trying to compensate for the driveway. If you are still having trouble wrapping your head around this, for a moment, consider the beam of your headlight as parallel to the road surface. Draw two parallel lines on a piece of paper. Now tilt the paper to any angle you like and the 2 lines are still parallel. Now draw a second line with a slight convergence with the other line (the actual situation with your headlight). You can still tilt the paper to any angle you like and the two lines remain the same relative to each other. On a constant incline, your headlight does the same thing.
If your driveway varies in incline from one end to the other, just find another location as that is much less complicated than trying to compensate for the driveway. If you are still having trouble wrapping your head around this, for a moment, consider the beam of your headlight as parallel to the road surface. Draw two parallel lines on a piece of paper. Now tilt the paper to any angle you like and the 2 lines are still parallel. Now draw a second line with a slight convergence with the other line (the actual situation with your headlight). You can still tilt the paper to any angle you like and the two lines remain the same relative to each other. On a constant incline, your headlight does the same thing.
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Road Captain
Joined: May 2012
Posts: 528
Likes: 0
From: Bel Air, MD
Parked my truck alongside the drive and leaned a sheet of plywood against it then parked the bike on my walk in front of my house; gave me plenty of level space. Found my light was high and to the left, guess that is why people were flashing lights at me. Plus I installed a Hella e-code so now any fine tuning will be along the roadside.
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