To many opinions to quote, so I will just offer mine.

We have many similar crossings on a local trail. Most of them are not controlled, but there are 2 that have signal lights for the trail and 2 others that require the cyclists to use the pedestrian cross walk (these are at very busy intersections). There are also 2, soon to be 3, crossings where the trail user can push a button to actuate flashing yellows. While the signals at the busy intersections seem to work; cars are used to stopping for the traffic on the intersecting street. The ones just for the trail are iffy. Yes you get a crossing signal, but you are stupid to take it as a sign that it's safe to stop. Also, the actuating buttons are placed in a location where it is very inconvenient to press. Most of the time, I will gauge traffic and blow across if safe. If not, I will just wait till it is. The un-controlled crossings work well because trail users are not lulled into assuming traffic will stop.

4 way stops are absolutely useless, since most users will assume that the other users will stop.