What is the most critical thing to do before you pass another vehicle?

Similarly, when passing a vehicle you are allowed to exceed?

Some states allow drivers to speed when passing slow vehicles. But, how fast can you go over the speed limit? It varies, but sometimes, when overtaking another car, you are allowed to exceed the speed limit by 10-15 mph. Typically, this applies to two-lane highways where the posted speed limit is 55 mph or higher.

Secondly, is it legal to pass 2 cars at once? Even though there is no law against passing more than one vehicle at a time, it is not recommended. The law says the driver of a vehicle overtaking another vehicle shall pass to the left at a safe distance and not return to the right side until safely clear of the other vehicle.

Then, when can you not pass another vehicle?

Passing is illegal and unsafe when your line-of-sight is restricted or limited by a curve, hill, or weather conditions, cross-traffic is present, when there is a solid yellow line on your side of the roadway, or a school bus is loading or unloading children. You must constantly be aware of passing vehicles.

When passing another vehicle you should return to your original lane when?

When driving, you should stay at least 2 seconds behind the vehicle in front of you. When passing a vehicle, you should return to the right lane when you can see both its headlights in your rearview mirror.