It is said that water and oil don’t mix. I am sure there are other things that don’t mix, but water and oil are well known and what immediately comes to mind. Something else that doesn’t mix … 1.5 or more tons of steel, plastic, rubber, etc. we call cars, trucks, buses, etc. and bicyclists. When they “mix it up” the bicyclists almost always comes out with the worst end of things. That being the case there are those who attempt to come up with ideas to implement to make it safer for bicyclists and motor vehicles to coexist safely. One of those ideas is referred to as “PROTECTED INTERSECTIONS”. Several different designs have been tried.
Here are some examples:
And HERE (.pdf document)
Protected bike lanes are also a great concept. The Dutch people are light years ahead of most of the rest of us when it comes to cycling safety. There is hope however as various communities are looking at what can be done to improve things.