I'd be curious what the collision *rate* is between marked, unmarked, and unmarked midblock crossings... but acquiring adequate data for that isn't particularly feasible.
I'd also be curious how collisions varied in cause between ped error, lead vehicles failing to give way, or multithreat.
Suggesting that a crosswalk is "the most dangerous place" for pedestrians is utterly irresponsible. Pedestrian collisions tend to be in crosswalks because that's where the pedestrians are. As for the supposedly most dangerous intersections, the list shows only the busiest intersections: lots of pedestrians, and heavy traffic, ergo that's where the accidents happen.
DC is the worst place I have experienced as a pedestrian and I've lived in Los Angeles, San Francisco, Raleigh, Durham, and Nashville! I cannot believe how every time I cross, cars drive through or turn while I'm still walking in the crosswalk! In other parts of the country, drivers wait until you have reached the curb before they enter the crosswalk!!
I personally know two people who have been hit by cars at crosswalks in the DC metro area. Watch out!
For those of you who live, work, or travel along the Southern Avenue corridor, you might want to check out a Public Meeting being held by DDOT tomorrow 6-6-12 @ United Medical Center, 1310 Southern Ave, SE from 6:00-7:30pm. OPEN to the public. They will be discussing pedestrian and traffic safety among other things.