Table 20: Crashes at Red Light Camera Intersections Since Installation Controlling for Exposure
The observed count of crashes in the before period, the observed number of crashes in the after period for all approaches at the Red Light Camera intersections and the monitored approaches. The table also provides the monthly average crashes in the before and after periods and the average difference. A positive average difference indicates an increase in the average crashes from the pre to post time period and a negative difference indicates a decrease in the average number of crashes from the pre to post time periods.
Table 20. Crashes at Red Light Camera Intersections Before and After Controlling for Exposure
|
|
Pre-Count |
Post-Count |
Count Increase / Decrease |
Percent Increase / Decrease |
After RLC Monthly Average |
Before RLC Monthly Average |
Difference |
|
All Approaches |
|||||||
|
Total Crashes |
1740 |
1769 |
+19 |
+1.1 |
3.37 |
3.34 |
0.03 |
|
Injury Crashes |
579 |
459 |
-120 |
-26.1 |
0.88 |
1.11 |
***-0.23 |
|
PDO Crashes |
1161 |
1308 |
+147 |
+12.7 |
2.50 |
2.23 |
** 0.27 |
|
Rear End Crashes |
1256 |
1386 |
+130 |
+10.4 |
2.65 |
2.41 |
* 0.24 |
|
Angle Crashes |
328 |
213 |
-115 |
-54.0 |
0.41 |
0.63 |
***-0.22 |
|
Monitored Approaches |
|||||||
|
Total Crashes |
951 |
1,000 |
+49 |
+5.2 |
2.30 |
2.18 |
0.12 |
|
Injury Crashes |
329 |
270 |
-59 |
-21.9 |
0.62 |
0.75 |
* -0.13 |
|
PDO Crashes |
622 |
729 |
+107 |
+17.2 |
1.68 |
1.42 |
*** 0.26 |
|
Rear End Crashes |
716 |
814 |
+98 |
+13.7 |
1.88 |
1.64 |
* 0.24 |
|
Angle Crashes |
164 |
103 |
-61 |
-59.2 |
0.43 |
0.54 |
* -0.11 |
Note: #p<0.10, *p<0.05, **p<0.01, ***p<0.001