Isn't it like driving by braile? Trying to stay to the right of the little bumps in the middle of the road...
Actually it is when the front tires hit or roll over an obstruction (rock, ditch, rut, et.) and try to turn from the course you are steering. This deviation (resulting from the "bump") is transmitted through the steering linkage to the steering wheel and then into the driver's arms. Any slop in the linkage can increase the bump felt by the driver due to the ability of the linkage to "get some speed" while taking up the slack. BAD JU-JU for driver's arms. Some methods that have been used in the past (and today) to prevent this or lessen the effects are:
Steering Stabilizers- works like a shock absorber and slows the movement
Power Steering- Hydraulic components prevent the wheels from kicking back and give the driver a definate mechanical advantage
Hydraulic Steering- Use a ram from a forklift and you can actually push the front end of the vehicle sideways by placing the front wheel against a rock and turning the steering wheel. Not legal on highway.
Probably a few I can't think of right now. If you can remember my old tan 4X4 you can guess some of the crap I went through to make the stupid thing go straight. 44" tires have a mind of their own when you can put the horses to them.
'99 F-350 Dually
Lookin' for a Sammy
I'm not stuck! I just need to give it more gas...