Often it's the simple things that make a big difference, and one of the most frustrating things as a cyclist is that often it is impossible to trigger traffic signals with a bicycle. This means you have to get off your bike, walk over to the sidewalk, push the pedestrian crosswalk button, walk back into the road, get back on your bike - and if a car pulls up in the meantime, you've lost your place in the road, and you have to "go to the end of the line" so to speak. Or the alternative that some use - run the red light when there's nobody coming.
However, simply allowing a cyclist to trigger the traffic signal with their bicycle removes the inconvenience and the temptation to disregard the signal. These have been popping up all over the place in Portland lately, and they've been a very welcome addition to the roads. Simple positive reinforcement to make it more appealing to everyone to obey the law and keep the roads in order.