This doesn't even seem like an accurate simulation, if bus 1 is unloading/loading at a bus stop and bus 2 catches it, bus 2 waits for bus 1. This makes sense in

This doesn't even seem like an accurate simulation, if bus 1 is unloading/loading at a bus stop and bus 2 catches it, bus 2 waits for bus 1. This makes sense in the context of the website because buses always drop off/pick up passengers when they get to a bus stop. But that isn't how it works in real life, if bus 2 doesn't have to drop off someone while bus 1 is at the stop it will just leapfrog past it. The fact that busses don't overtake each other seems to be the reason the bunching happens, as soon as the front bus starts slowing down a little it's inevitable bus 2 will catch it and then the situation can't be fixed.