detect agent that actually drives a vehicle with llVolumeDetect / collision_start ?

Ok, I am stucked, and no ideas....

Trying to make a counter for races, and ran into the following problem:

Using llVolumeDetect works fine, asl long as the object that collides wih the counterline is an avatar (agent).
If the agent now sits on a vehicle, instead of the avatar the vehicle object is detected as on the collision_start event. Bad on that is every active script task, for example each wheel that contains a script for turning etc. is triggering a collision start now, so passing the counterline with a vehicle with an active vehicle script plus 4 wheel scripts counts the laps down now by 5...

Has someone an idea if it ispossible - and how, to either:
- detect only the avatar that is sitting on the vehicle and steering it when it crosses the
llVolumeDezect object ?

or

- detect one single script or prim sinside the vehicle, that can be used as a trigger so the
collision event only reacts if this specific prim/script collides ?

Would be very thankful for every idea or help.

Have part of the vehicle detect collision with the counter and use that to trigger some form of communication with the counter.

Thank you for your reply Newgate,

thought about hat already too but gave up on it cause a communication beteween the vehicle and the counter is not reliable in laggy situations on a race event wif many ppl are there...

Solved it now in the way that I use a short timer and check if the the collision event already appeared within a time of maybe 3-5 seconds, if that is the case the collision is ignored. The checklist resets itself after 3-5 seconds, so a new collision of the same vehicle ID being detected later is registered again.

could you just change the llcollisionfilter so that way it doesn't accept anything after the first collision?

maybe couple that with a laptimer object of a known name/key that you can filter against and request every racer attach to their car?

Like:

llCollisionFilter("LapTimer", NULL_KEY, TRUE);

for an object named LapTimer?

Not sure if that would work, but seems it might if you are registering multiple collisions for the link set comprising the car.