UC Davis alumnus here. Bike lanes at full capacity work much better than motor vehicle lanes at full capacity. You may have to wait to join the traffic, but since you need a smaller space there’s less wait time. Roundabouts are very efficient. Accidents do happen, but are far, far less deadly and can almost always be cleared in under two minutes.

Just watch out for freshmen at the first rainstorm. You can tell them apart by their freshman stripe — the result of not having a rear fender.