I've noticed that on the west coast, drivers get tickets for rolling thru crosswalks when pedestrians are trying to cross and jaywalking laws are (or were) enforced. Meanwhile in several East Coast cities, jaywalking is an art form and crosswalks appear to be suggestions for drivers and peds. DC attracts a lot of transients and out of towners; the Accord driver may have been from one of the states where a crosswalk MEANS something, while the Jeep driver is typical of the self-absorbed Washingtonian (although if he was looking for a gas station, he'd KNOW DC is way more expensive than either Maryland or Virginia).

An interesting local habit is driver behavior where the W&OD bike trail crosses semi-busy streets and the crossing is marked with a crosswalk. At several of these crossings that I use on my commute, drivers will stop and wave cyclists through. Note we have a stop sign as well and the local police will enforce it if they're present. I've had plenty of times where I'm still well back from the crossing and a driver waves me through. I always check to make sure no one else is coming before I go (I've seen near misses where the cyclist went for it), sometimes I'll wave them through (or try). About a 1/3 of the time, another driver is like the Jeep driver - not paying attention - and they have to slam on their brakes to stop. Regardless of if the 1st driver was correct in stopping, once they've stopped, it is still the responsibility of driver #2 to not rear end them (automatic at fault in Virginia).