Actually, a reasonable solution in areas like this is a road that’s basically designed as a one-way road at different times of day.
I’ve often thought that US 29 in MD could be a southbound-only road during morning rush and northbound-only during evening rush.
I don't know--are we sure that the road is all people from Gaithersburg and Germantown looking to go to Laurel in the morning? Or is it people from Laurel trying to get to jobs in Gaithersburg? Might be both. I don't have any data on this so I'm just asking.