Investigate beginning of lane vehicle injection

[Gamenot]

A bug investigation is required to look into the problems involved with injecting a vehicle at the beginning of the lane in the following cases:

• The beginning of a lane coming from a dead end
• The beginning of a lane with a vehicle at the end of the previous lane

I think there is a bigger issue here, the problem this tried to address is that injecting a vehicle so close to the beginning of the lane would potentially inject on top of another vehicle but this is not the way to fix that issue.

Originally posted by @Gamenot in #1205 (comment)