Table 2. Risk Factors and their Crash Frequencies by Injury Type.

	Severe Injury (%) (n=1019)	Non-severe injury (%) (n=4641)
Avg. Driving Speed (mph)	25	20
Avg. Posted Speed (mph)	35	30
Protective Equipment
No Protection	80.5	74.9
Safety Helmet	17.6	17.2
Eye Protection	1.9	1.3
Unknown	0.1	6.7
Alcohol/ Drug Use
Yes	11.6	5.4
No	88.4	94.6
Time of Day
6:01am- 9:00am	5.3	6.1
9:01am- 12:00pm	10.4	11.1
12:01pm- 2:00pm	10.6	12.2
2:01pm- 4:00pm	14.6	15.6
4:01pm- 7:00pm	25.6	26.7
7:01pm- 11:00pm	20.3	18.5
11:01pm- 6:00am	13.1	9.9
Day of the week
Monday	13.5	13.4
Tuesday	13.3	12.2
Wednesday	12.1	12.9
Thursday	15.4	14.7
Friday	15.4	16.9
Saturday	15.7	15.4
Sunday	14.6	14.5
Lighting conditions
Dark (no light)	5.6	3.6
Dark (street light)	26	22.7
Dusk	3.2	4
Dawn	0.8	1
Daylight	64.5	68.8
Weather
Cloudy	15.2	12.8
Rainy	3.8	5
Foggy	0.2	0.2
Clear	80.8	82
Town Classification
College	2.3	4.2
University Associated	23.5	22.2
Other	74.3	73.6
County Location
Coastal	89.3	88.6
Non-coastal	10.7	11.4
Roadway
Off-roadway	85.3	84.8
On-roadway	14.7	15.2
Road surface type
Slag/ Gravel/ Stone	4	4.3
Brick/ Block	0.1	0.6
Concrete	3.4	3.9
Dirt	1.3	1
Blacktop	91.2	90.1
Road surface condition
Wet	6.8	8.2
Slippery	0.8	0.9
Icy	0.1	0.02
Dry	92.3	90.9
Type of Shoulder
Curb	41.5	41.9
Paved	31.7	33.2
Unpaved	26.9	24.9
Highway type
Divided	37.5	32.5
Undivided	62.5	67.5
Number of Lanes
0	6.2	11.1
1	1.6	2.8
2	45.9	47.4
3	3.7	4
4	25.3	21.7
5	2.7	2.5
6	12.6	9.2
7	0.7	0.7
8	0.7	0.6
≥9	0.6	0.1