I would like a risk/rating system for intersections (maybe that could even be done in a crowd sourced way, and then an official one from the city)...there are a number of specific things that should be measured...
1) Road geometry is up to date to standards (ie approach lane widths, curve radiuses, appropriate separation, etc.)
2) Road signage/signals is appropriate, speed limit
3) Protection for vulnerable road users (ie. bollards, separation of bike lanes etc.)
4) Non-standard, or unexpected road design features (ie. 5+ road intersections, off ramps, high speed->low speed transitions, intersection includes driveway, off-angle intersections, one-way, do not enter, etc.)
5) Appropriate road markings (coloured bike lanes, different paving methods)
6) Visibility in bad conditions (rain, snow, darkness), lighting, distractions (signage, illuminated signage)
7) Official review done in the last X years
8) Injuries/deaths/crashes/reports/complaints
9) Traffic levels/pedestrian levels
10) Other risks - bus stops, schools, seniors, parks etc.
11) Street Mobility Limitations (wheelchair access, pedestrians can't cross 1/4+ ways)
There are a number of intersections in Toronto that I am often surprised don't get more attention - DVP/Castle Frank - with a school, an off-ramp, a subway, high speed traffic, lack of 4 way pedestrian crossing, bike lanes, weird geometry, high speed around corners, park, and multiple left/right, driveway and a bixi station and a few weird crossing/intersections/turn limitations....accidents happening all the time...and yet nothing is done.
All standard 4 or 3 way intersections should be comparable in some way to the others...and then all the other non-4 way intersections should be able to be compared in a reasonable way for risk.
For a big number of these you could probably automate it based on google maps and street view...road geometry and signage etc...but then have more details that could be added by the community or the city.