Journal of Advanced Transportation / 2019 / Article / Tab 1

Research Article

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

Table 1

Summary of descriptive statistics.

VariableProportion%MeanS.D

At-Fault Driver
Young If driver is under< 35 years = 1, otherwise = 070.00.700.457
Middle If driver is between 35 - 50 years = 1, otherwise = 025.20.250.434
Old If driver is above > 50 years = 1, otherwise = 04.50.040.207
Male If driver is male= 1, otherwise = 090.90.910.288

Road Geometry
Curve If crash occurred in curve section = 1, otherwise = 07.20.070.258
Straight If crash occurred in straight section = 1, otherwise = 043.00.430.495
U- Turn If crash occurred in U-turn section = 1, otherwise = 021.70.220.413
Grade If crash occurred in straight & grade road = 1, otherwise = 028.10.280.450

Crash Information
Heavy vehicle If a heavy vehicle was involved = 1, otherwise = 046.10.460.49
Passenger If a passenger car was involved = 1, otherwise = 074.90.750.43

Environmental Factors
Weekdays If crash occurred on a weekday = 1, otherwise = 041.00.410.49
Daytime If crash occurred during daylight = 1, otherwise = 047.60.480.50
Fog If crash occurred under foggy weather condition = 1, otherwise = 034.70.350.47
Winter If winter season (Dec.–Jan.–Feb.)= 1, otherwise = 040.60.410.49
Summer If summer season (Jun.–Jul.–Aug.)= 1, otherwise = 015.40.500.36
Rain If crash occurred under rainy weather condition = 1, otherwise = 06.70.070.25

Work zone Information
Rural If crash occurred in rural area = 1, otherwise = 066.50.670.47
Speeding If exceeded posted speed limits = 1, otherwise = 058.70.590.49
N. lane closures If more than one lane closures = 1, otherwise = 062.30.620.48

Type of construction
Asphalt If surface construction is asphalt = 1, otherwise = 022.60.230.41
Base If surface construction is base = 1, otherwise = 015.00.150.35
Remove Asphalt If surface construction is removing asphalt = 1, otherwise = 030.40.300.46
Milling If surface construction is milling= 1, otherwise = 010.20.100.30
Concrete If surface construction is concrete = 1, otherwise = 021.70.220.41

Crash Severity
No injury16.8%
Injury59.6%
Fatal injury23.6%

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