Why the hell not? Is a cyclist just supposed to wait there until a “helpful” motorist comes along to trip the sensor, or go over to press the pedestrian beg button, or just sit there until the statute of limitations runs out?
No they don’t. You’re not slowing down enough, or your car is a total piece of junk that’s not road worthy.
Granted, speed humps are a bandaid solution to speeding. If speeding is a problem then the street is too wide, too clear, and too over-engineered. It’s not surprising since many states and municipalities have dropped anything with less than a 35mph design speed out of their manuals, and in some cases 40 or 45mph is their minimum design speed. That’s wholly inappropriate for any residential area, main street, and most anywhere people are present. It leads to wide lanes, sweeping curves, long sight lines, big clear zones, no parking, and large building setbacks. All those things communicate “this is a highway, go fast” so guess what happens?