Comparison of Factors Affecting Crash Severities in Hit-and-Run and Non-Hit-and-Run Crashes

Table 1

Variables description and percentage distribution for HR and NHR crashes.

Variables	Descriptions of variables	HR crashes		NHR crashes
		No. of crashes	Distribution	No. of crashes	Distribution
Crash severity
PDO	PDO crash=1; otherwise=0	28587	93.25%	77321	89.29%
Injury	Injury crash=1; otherwise=0	2052	6.69%	9173	10.59%
Fatal	Fatal crash=1; otherwise=0	16	0.05%	104	0.12%
Traffic control device
No control	No control=1; otherwise=0	20368	66.44%	47053	54.33%
Stop sign/flasher	Stop sign/ flasher =1; otherwise=0	2502	8.16%	9347	10.79%
Traffic signal control	Traffic signal control =1; otherwise=0	6279	20.48%	26380	30.46%
Other	other control device=1; otherwise=0	376	1.23%	1432	1.65%
Unknown	Unknown =1; otherwise=0	1130	3.69%	2386	2.76%
Device condition
No controls	No controls=1; otherwise=0	20303	66.23%	47558	54.92%
Not functioning	Not functioning =1; otherwise=0	103	0.34%	295	0.34%
Functioning improperly	Functioning improperly =1; otherwise=0	137	0.45%	589	0.68%
Functioning properly	Functioning properly =1; otherwise=0	8083	26.37%	33204	38.34%
Other	Other condition =1; otherwise=0	205	0.67%	699	0.81%
Unknown	Unknown =1; otherwise=0	1824	5.95%	4253	4.91%
Weather
Clear	Clear weather=1; otherwise=0	23702	77.33%	69679	80.46%
Rain	Rain =1; otherwise=0	2480	8.09%	8227	9.50%
Snow	Snow=1; otherwise=0	1236	4.03%	3538	4.09%
Cloudy	Cloudy =1; otherwise=0	759	2.48%	2550	2.94%
Other	Other weather =1; otherwise=0	189	0.62%	623	0.72%
Unknown	Unknown weather=1; otherwise=0	2286	7.46%	1981	2.29%
Lighting condition
Daylight	Daylight=1; otherwise=0	16935	55.24%	60593	69.97%
Darkness, lighted road	Darkness, lighted road=1; otherwise=0	7970	26.00%	16929	19.55%
Darkness	Darkness=1; otherwise=0	1930	6.30%	3616	4.18%
Dusk	Dusk=1; otherwise=0	876	2.86%	2642	3.05%
Dawn	Dawn=1; otherwise=0	604	1.97%	1470	1.70%
Unknown	Unknown condition=1; otherwise=0	2340	7.63%	1348	1.56%
Crash type
Fixed object	Fixed object=1; otherwise=0	886	2.89%	4578	5.29%
Pedestrians	Pedestrians =1; otherwise=0	972	3.17%	2196	2.54%
Parking vehicle	Parking vehicle=1; otherwise=0	13369	43.61%	12532	14.47%
Turning	Turning=1; otherwise=0	2555	8.33%	14303	16.52%
Rear-end	Rear-end=1; otherwise=0	5198	16.96%	23106	26.68%
Sideswipe same direction	Sideswipe same direction=1; otherwise=0	4128	13.47%	13895	16.05%
Sideswipe opposite direction	Sideswipe opposite direction=1; otherwise=0	472	1.54%	1278	1.48%
Pedal cyclist	Pedal cyclist=1; otherwise=0	434	1.42%	1581	1.83%
Angle	Angle=1; otherwise=0	2209	7.21%	10879	12.56%
Head on	Head on=1; otherwise=0	276	0.90%	820	0.95%
Other	Other collision type=1; otherwise=0	156	0.51%	1430	1.65%
Trafficway type
Not divided	Not divided=1; otherwise=0	13642	44.50%	41040	47.39%
Parking lot	Parking lot=1; otherwise=0	2547	8.31%	5499	6.35%
One-way	One-way=1; otherwise=0	5910	19.28%	9300	10.74%
Divided with median barrier	Divided with median barrier=1; otherwise=0	6359	20.74%	24038	27.76%
Other	Other trafficway type=1; otherwise=0	1816	5.92%	5878	6.79%
Unknown	Unknown type=1; otherwise=0	381	1.24%	843	0.97%
Road surface condition
Dry	Dry surface=1; otherwise=0	22386	73.03%	65549	75.69%
Wet	Wet surface=1; otherwise=0	3772	12.30%	12627	14.58%
Snow/slush	Snow/slush surface=1; otherwise=0	1357	4.43%	3435	3.97%
Other	Other condition=1; otherwise=0	219	0.71%	1010	1.17%
Unknown	Unknown condition=1; otherwise=0	2921	9.53%	3977	4.59%
Crash damage in dollar value
$500 or less	$500 or less=1; otherwise=0	4390	14.32%	11932	13.78%
$501 - $1500	$501 - $1500=1; otherwise=0	9211	30.05%	24219	27.97%
Over $1500	Over $1500=1; otherwise=0	17054	55.63%	50447	58.25%
Number of units involved
One unit	One unit=1; otherwise=0	908	2.96%	5571	6.43%
Two units	Two units=1; otherwise=0	27539	89.84%	75291	86.94%
More than two units	More than two units=1; otherwise=0	2208	7.20%	5736	6.62%
Day of week
Weekday	Weekday=1; otherwise=0	21130	68.93%	64946	75.00%
Weekend	Weekend=1; otherwise=0	9525	31.07%	21652	25.00%
Crash hour
AM peak hour	AM peak hour=1; otherwise=0	4245	13.85%	14283	16.49%
PM peak hour	PM peak hour=1; otherwise=0	5133	16.74%	15871	18.33%
Non-peak hour	Non-peak hour=1; otherwise=0	21277	69.41%	56444	65.18%