Using all that asphalt doesn't increase throughput at the chokepoint, right? If the queue is long enough that people who want to exit before the chokepoint are needlessly prevented from accessing the exit, then using all the lanes could help, but it won't get anybody through the chokepoint any faster that I can tell.

Zip merging is more efficient for reducing backups:

https://itre.ncsu.edu/itre-studying-how-zipper-merges-reduce...