If you change lane in a multi lane situation with equal rights of way then you are responsible. It’s as simple as that, because you made the change in the situation. Having your engine stop suddenly is not only annoying, it can be downright dangerous! You can easily loose control of your vehicle if someone changes lanes suddenly. If you are driving at higher speeds on a highway, this could mean serious trouble. The most important thing to do if this happens to you is to reduce speed as much as possible.