Executive Summary: You may have never heard of the MMUCC (Model Minimum Uniform Crash Criteria; a set of federal guidelines), it trickles down into every state’s motor vehicle crash reporting system. It’s somewhat analogous to the relationship between the UVC and state’s vehicle codes. The problem, I should say one problem, is non-motorists tend to get overlooked. One obvious example is delved into here — the “Manner of Crash”, e.g. angle, rear-end, sideswipe, etc. is ONLY defined when it involves two motor vehicles, leaving that data-field undefined when a crash is between a MV and bicyclist. Since bicyclists are vehicle drivers, the MMUCC should reflect that. Read on for a proposed change that’s on the table, and how you can vote/comment officially: Continue reading “MMUCC C9 Manner of Crash”
Tag: MMUCC
Collision Manner
[Warning/correction not yet made: in the table below where it says MV-only, that’s not quite correct, it’s really incidents where no pedalscylists are involved. The MV-only calculations should also exclude pedestrians; this can be accomplished by saying u.eUnitType LIKE ‘PED%’ In the query below i corrected it but didn’t correct the table; the percentages don’t really change since there are relatively few ped crashes ]
Here is a breakdown of Collision Manner, and rates, for MV collisions (i.e. one or more MV, and not involving a ped or bicyclists) compared to bike-MV collisions.
The megatrends are that rear end collisions are, by far, the predominant manner of collision for MVonly crashes; wheres for bike-MV crashes this manner is quite infrequent — almost twelve times more frequent. For bike-MV crashes, the predominant manner is angle, i.e. so called “turning and crossing” movements (although left turn is broken out as a separate manner).
The 38% rate of REAR END crashes for MVs actually understates the rate — if you back out the number of SINGLE VEHICLE crashes; you see that nearly half of all multi-car collisions are REAR END(!). 38,499/(101,055 – 18,647) = 47%. Inattention? Does this mean that motorists actually are more attentive to same-direction traffic when it’s a bicyclist, compared to another motorist? hmmm.
+------------------------------+-------+--------+------+--------+-------------+ | eCollisionManner | MVonly| MVrate |bikeMV|bikerate|MV:bike ratio| +------------------------------+-------+--------+------+--------+-------------+ | REAR_TO_REAR | 287 | 0.0028 | NULL | NULL | NULL | | UNKNOWN_99 | 859 | 0.0085 | 40 | 0.0189 | 0.44973545 | | REAR_TO_SIDE | 895 | 0.0089 | 11 | 0.0052 | 1.71153846 | | SIDESWIPE_OPPOSITE_DIRECTION | 1244 | 0.0123 | 46 | 0.0217 | 0.56682028 | | HEAD_ON | 1438 | 0.0142 | 45 | 0.0212 | 0.66981132 | | OTHER_97 | 3160 | 0.0313 | 404 | 0.1905 | 0.16430446 | | SIDESWIPE_SAME_DIRECTION | 10727 | 0.1062 | 124 | 0.0585 | 1.81538462 | | LEFT_TURN | 11888 | 0.1176 | 189 | 0.0891 | 1.31986532 | | ANGLE_FRONT_TO_SIDE | 13411 | 0.1327 | 1194 | 0.5629 | 0.23574347 | | SINGLE_VEHICLE | 18647 | 0.1845 | NULL | NULL | NULL | | REAR_END | 38499 | 0.3810 | 68 | 0.0321 | 11.86915888 | +------------------------------+-------+--------+------+--------+-------------+ total num of MVonly crashes = 101,055. total num of bike-MV crashes = 2,121 source: 2012 ASDM