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Yes.
Yes.
When behind a slow-moving farm vehicle, it is best to exercise patience and maintain a safe distance. Avoid tailgating or making risky overtaking maneuvers. Only pass when it is safe to do so and there is clear visibility of the road ahead.
The rear car would be at fault for not making a safe pass.
a driver behind your vehicle is trying to pass you
Yes, it is legal to pass the postal vehicle, but only on the terms of the vehicle being on it's route (delivering mail). It would be illegal/unnecessary if the vehicle was not on route, and not doing any stops.
If one is referring to a situation in which a vehicle does not pass a smog inspection, there might be several causes. One might be the catalytic converter or an old gas cap.
Pass a motorcycle the same way you would pass a car. If you are passing on a curve just remember that motorcycles can take turns faster than a car and that many take the shortest line through a curve.
That would depend on the type of vehicle. If it is a low emissions vehicle you have to go with the oem catalytic converter.
Yes. Always treat a motorcycle as If it is a full-sized vehicle.
Never. The only time you can pass another vehicle on the right is if there is a lane on that side you can go into to pass it.
Pull over! If it's just an emergency vehicle, it will pass and then you can continue on your way. If you are being pulled over by the police, they will pull up behind you when you stop and then they will question you and possibly ticket you if you've broken a law.