Some interesting stuff here, including links to more studies showing similar results in different countries.
The summary is that the reason motorists break more laws is that speeding is so common.
I don't think this is because motorists are all evil and cyclists are all saints. Probably, the reason motorists break speed limits is that it can be relatively difficult to keep cars below the speed limit. It's all too easy to absentmindedly speed up. It's also, perhaps becuase of this, widely seen as socially acceptable to break the speed limit (speaking anecdotally).
One interesting thing here, which may not surprise regular readers of Fuck Cars, is that better cycling infrastructure leads to less lawbreaking by cyclists. As is often the case, it's the design of roads and cities that changes behaviour, not abstract appeals to road users to be sensible!
We have a few municipalities around here that are adding stop lights for cyclists where multiuse paths meet intersections (to control the cross rides).
It’s more of a safety thing, but I’ve almost been run over several times while crossing them on a WALK/BIKE green, since motorists really don’t care at all.
You will often get a motorist committing to a left turn going into the cross ride, and since they didn’t look first and didn’t give themselves any time before the oncoming traffic arrives, they’ll plow through the cross ride/cross-walk. To say that I see this happening all the time is not an exaggeration.
A place where two multi-use paths cross is entirely different from a place where a multi-use path crosses a street. The signal for the latter is still because of the cars, not the bikes, even if it’s directing the latter.
That’s a really rare sight to see in my region. I wish we had enough multi-use paths to actually have them cross! LOL