Why do passing trucks suck instead of blow?

Vulcan Rider wrote:

cbshoestring wrote:

BUT.....to suggest that the wiggle point in the middle has that much affect.....would also suggest that a class A/B or even c has nothing to be concerned with.

You are contradicting yourself.

LESS effect does NOT mean NO effect.

When there is a pivot point in the middle, the effect is slightly different and more pronounced.

If there is no pivot point, there is a fairly large area square in the middle where the extra pressure or suction or whatever is roughly equal on both front and rear wheels and unless your steering gear or an axle is loose, little or no correction is needed with a 90 degree side wind.....up to a point.

The big problem occurs when the side vector is applied ONLY to the front or back....or to the middle if there is a pivot point there.

Airflow encountering an empty space(between TV & TT) will not speed up. Nothing to squeeze it. Thus I still think the principle you are refering to has more to do with the shock wave being pushed away from the passing vehicle, and less to do with the topic on hand which is the "lift" created by two vehicles smooshing the air between them. Squashed air will cause a lift toward the squashed air....not a push.

Let the debate begin whether or not the air between the TV & TT flows smothly along the outer edge, or has a bump in it.....since the airflow pushing out and past a vehicle is caused by the nose...not the side.

None of which has anything to do with the OP's original observation. YES OP, there is a sucking feeling when two vehicles pass. Sometimes that feeling is rather scary. Prepare for it...watch your mirrors, move to the outer edge of the lane if you see someone about to pass you. Keep up with traffic flow (speed is the key...not bigger and badder TV---although mass helps) DO NOT over-correct. The change in air-flow is temporary. Hang on, ride it out.