Here's why:

* Velocity includes both speed and direction.

* If two cars have the same velocity, they are moving at the same speed in the same direction.

* This means they are maintaining a constant distance between each other.

* Without a change in velocity (either speed or direction) for one or both cars, there would be no way for them to come into contact.

However, it's important to consider that:

* Real-world scenarios can be more complex due to factors like:

* Driver error: One car might swerve slightly or brake unexpectedly.

* Road conditions: Wet or icy roads can affect traction and control.

* Mechanical failures: A car's brakes or steering could fail.

In these situations, even cars with the same initial velocity could collide.