Highway interchanges are perhaps the most dangerous place to ride a bike. You have high-speed merges going on where drivers are not expecting to find cyclists or pedestrians. Traffic engineers often make the problem worse with idiotic striping. For example, this bike lane in Orinda running between a double right-hand freeway on-ramp (Streetsblog called it the Worst Bike Lane in World):
There are a couple problems here. The first is that traffic engineers keep “upgrading” major arterial roads into freeways, converting ordinary intersections into interchanges. The second problem is that Federal design standards are completely outdated for bike accommodation at highway interchanges.
This shouldn’t be a hard problem, because Dutch cycle planners figured out the solution a long time ago:
That is a pretty standard interchange configuration in Holland. The signalization allows for cyclists to cross the offramp, without having to worry about high-speed car traffic.