I have a question about the effect of highway onramps (or one-way roads) and congestion, when it comes to two way roads.
The idea is, if I have a large two way road, and I want to create some highway onramps, from a congestion point of view - I don't want have a situation where traffic is crossing traffic to get onto the onramp.
That is, assuming it's right-hand traffic, to get onto the onramp, the traffic just needs to turn right onto the onramp, (and thus never obstructing oncoming traffic), and similarly to get off an onramp, they turn right and merge with the traffic flow.
So total, I'd have four onramps, two each for each traffic direction.
The question is - is the only way for this to happen to create a pair of one way roads? Or is there a way to do it smartly with a two way road?