Characteristics of rear-end crashes involving passenger vehicles with automatic emergency braking

Figures & data

Table 1. Characteristics of crashes involving striking vehicles with AEB and control vehicles without front crash prevention (%).

Crash characteristics	Vehicles with AEB	Same-model control vehicles	Same-class control vehicles
Striking vehicle action	n = 1,078	n = 11,048	n = 224,884
Moving straight	67.0	73.1	74.8
Slowing or stopped	18.7	15.6	14.6
Turning	7.0	3.7	4.0
Changing lanes	1.4	1.9	1.9
Merging or passing	1.1	0.9	0.8
Other	4.9	4.8	3.9
Struck vehicle action	n = 843	n = 8,666	n = 181,308
Straight	17.7	19.1	19.8
Slowing or stopped	66.7	69.7	69.3
Turning	9.0	6.2	6.4
Changing lanes	2.0	1.0	1.0
Merging or passing	1.4	1.0	0.9
Other	3.2	3.0	2.7
Struck vehicle type	n = 943	n = 9,746	n = 210,588
Car	47.9	49.7	49.2
SUV	29.0	30.3	29.9
Pickup	12.8	11.7	12.7
Van	7.1	6.2	5.9
Not a passenger vehicle or special use	3.0	1.9	1.9
Unknown	0.2	0.3	0.3
Surface condition	n = 1,242	n = 12,570	n = 265,872
Dry	84.9	86.3	86.2
Wet	12.4	11.5	12.0
Snowy or icy	2.5	1.9	1.5
Other or unknown	0.2	0.4	0.3
Speed limit (mph)	n = 1,242	n = 12,570	n = 265,872
≤35	27.7	28.8	27.8
40–45	32.1	33.9	35.3
50–65	27.5	26.5	25.6
70+	6.0	4.1	4.2
Unknown	6.8	6.7	7.2
Striking vehicle turning; struck vehicle turning, changing lanes, not a passenger vehicle or special use; snowy or icy; or speed limit 70+ mph	n = 843	n = 8,666	n = 181,308
	25.3	15.9	16.1

Table 2. Results of logistic regressions modeling odds that a striking vehicle in a rear-end crash had AEB.^a

Crash characteristics	Odds ratio using same-model control (95% CI)	Odds ratio using same-class control (95% CI)
Striking vehicle action
Moving straight (reference)	1.00	1.00
Slowing or stopped	1.43 (1.18, 1.72)	1.38 (1.17, 1.64)
Turning	2.35 (1.76, 3.13)	1.86 (1.45, 2.39)
Changing lanes	0.80 (0.44, 1.44)	0.80 (0.48, 1.35)
Merging or passing	1.74 (0.89, 3.37)	1.48 (0.83, 2.65)
Other	1.08 (0.77, 1.51)	1.23 (0.92, 1.64)
Struck vehicle action
Moving straight	0.94 (0.76, 1.16)	0.93 (0.78, 1.13)
Slowing or stopped (reference)	1.00	1.00
Turning	1.66 (1.25, 2.21)	1.52 (1.19, 1.94)
Changing lanes	2.05 (1.13, 3.72)	2.08 (1.27, 3.43)
Merging or passing	1.67 (0.84, 3.29)	1.53 (0.84, 2.76)
Other	1.25 (0.81, 1.94)	1.20 (0.81, 1.79)
Struck vehicle type
Car (reference)	1.00	1.00
SUV	1.06 (0.89, 1.26)	0.98 (0.84, 1.14)
Pickup	1.13 (0.89, 1.43)	1.17 (0.95, 1.44)
Van	1.15 (0.84, 1.56)	1.16 (0.89, 1.50)
Not a passenger vehicle or special use	1.61 (1.01, 2.55)	1.53 (1.04, 2.27)
Unknown	0.79 (0.17, 3.65)	0.87 (0.21, 3.52)
Surface condition
Dry (reference)	1.00	1.00
Wet	1.14 (0.93, 1.38)	1.10 (0.92, 1.30)
Snowy or icy	1.83 (1.16, 2.86)	1.50 (1.03, 2.20)
Other or unknown	0.70 (0.21, 2.34)	0.63 (0.20, 1.99)
Speed limit (mph)
≤35	1.04 (0.88, 1.23)	1.04 (0.89, 1.20)
40–45 (reference)	1.00	1.00
50–65	1.10 (0.93, 1.31)	1.07 (0.92, 1.25)
70+	1.49 (1.10, 2.03)	1.40 (1.08, 1.82)
Unknown	1.13 (0.86, 1.49)	1.08 (0.84, 1.38)
Striking vehicle point of impact
11 o’clock	1.28 (0.99, 1.66)	1.22 (0.97, 1.53)
12 o’clock (reference)	1.00	1.00
1 o’clock	1.33 (1.07, 1.66)	1.34 (1.10, 1.62)
Struck vehicle point of impact
5 o’clock	1.36 (1.06, 1.76)	1.22 (0.97, 1.54)
6 o’clock (reference)	1.00	1.00
7 o’clock	1.60 (1.25, 2.05)	1.63 (1.32, 2.02)

^aStatistically significant values are shown in bold.