Identifying the Factors Contributing to Injury Severity in Work Zone Rear-End Crashes

Table 1

Summary of descriptive statistics.

Variable	Proportion%	Mean	S.D
At-Fault Driver
Young If driver is under< 35 years = 1, otherwise = 0	70.0	0.70	0.457
Middle If driver is between 35 - 50 years = 1, otherwise = 0	25.2	0.25	0.434
Old If driver is above > 50 years = 1, otherwise = 0	4.5	0.04	0.207
Male If driver is male= 1, otherwise = 0	90.9	0.91	0.288
Road Geometry
Curve If crash occurred in curve section = 1, otherwise = 0	7.2	0.07	0.258
Straight If crash occurred in straight section = 1, otherwise = 0	43.0	0.43	0.495
U- Turn If crash occurred in U-turn section = 1, otherwise = 0	21.7	0.22	0.413
Grade If crash occurred in straight & grade road = 1, otherwise = 0	28.1	0.28	0.450
Crash Information
Heavy vehicle If a heavy vehicle was involved = 1, otherwise = 0	46.1	0.46	0.49
Passenger If a passenger car was involved = 1, otherwise = 0	74.9	0.75	0.43
Environmental Factors
Weekdays If crash occurred on a weekday = 1, otherwise = 0	41.0	0.41	0.49
Daytime If crash occurred during daylight = 1, otherwise = 0	47.6	0.48	0.50
Fog If crash occurred under foggy weather condition = 1, otherwise = 0	34.7	0.35	0.47
Winter If winter season (Dec.–Jan.–Feb.)= 1, otherwise = 0	40.6	0.41	0.49
Summer If summer season (Jun.–Jul.–Aug.)= 1, otherwise = 0	15.4	0.50	0.36
Rain If crash occurred under rainy weather condition = 1, otherwise = 0	6.7	0.07	0.25
Work zone Information
Rural If crash occurred in rural area = 1, otherwise = 0	66.5	0.67	0.47
Speeding If exceeded posted speed limits = 1, otherwise = 0	58.7	0.59	0.49
N. lane closures If more than one lane closures = 1, otherwise = 0	62.3	0.62	0.48
Type of construction
Asphalt If surface construction is asphalt = 1, otherwise = 0	22.6	0.23	0.41
Base If surface construction is base = 1, otherwise = 0	15.0	0.15	0.35
Remove Asphalt If surface construction is removing asphalt = 1, otherwise = 0	30.4	0.30	0.46
Milling If surface construction is milling= 1, otherwise = 0	10.2	0.10	0.30
Concrete If surface construction is concrete = 1, otherwise = 0	21.7	0.22	0.41
Crash Severity
No injury	16.8%
Injury	59.6%
Fatal injury	23.6%