These reports are compiled from data supplied by the Oregon Department of Transportation's Transportation Development Branch, Transportation Data Section, from records originally received by the Oregon Department of Motor Vehicles. Due to under-reporting of collisions, this list should not be considered to represent all collisions occurring at the intersections listed. Note also, due to the complicated coding procedures, it is possible that there may be additional high collision locations not yet identified. The analysis of the data and the resulting report were accomplished solely by the City of Portland's Bureau of Transportation System Management.
The equation used to compute the collision rate (collisions per million entering vehicles) for these locations is as follows:
where ADT is the average weekday daily traffic volume entering the intersection. Note that the volume used is considered to be approximate for a number of reasons; daily variation in counts, the count may not have been taken specifically at the intersection, the count may not be recent enough to reflect current conditions, etc.
|Report Period||Sorted by Rate||Sorted Alphabetically
by Area and Street Name
|1998-2001||9801 123||9801 ABC|
|1997-2000||9700 123||9700 ABC|
|1996-1999||9699 123||9699 ABC|
|1995-1998||9598 123||9598 ABC|
|1994-1997||97 Rate||97 ABC|
|1993-1996||96 Rate||96 ABC|
|1992-1995||95 Rate||95 ABC|
|1991-1994||94 Rate||94 ABC|