Research Article
Analyzing Traffic Crash Severity in Work Zones under Different Light Conditions
Table 1
Description of variables.
| | Category | Variables | Description: code | Light condition | | Daylight | Dark-lighted | Dark-not-lighted | | % (n) | % (n) | % (n) |
| | Driver | At fault (AF) | No (N) | 49.4% (7946) | 42.2% (1003) | 44.3% (651) | | Yes (Y) | 50.6% (8152) | 57.8% (1372) | 55.7% (817) | | Drugs and alcohol (D&A) | No (N) | 99.2% (15974) | 93.7% (2225) | 92.5% (1358) | | Yes (Y) | 0.8% (124) | 6.3% (150) | 7.5% (110) | | Vehicle maneuver (VM) | Changing lanes or merging (CL) | 25.3% (4065) | 19.2% (456) | 12.1% (178) | | Other (O) | 74.7% (12033) | 80.8% (1919) | 87.9% (1290) |
| | Vehicle | Body code (BC) | Not-truck-related (NT) | 97.1% (15632) | 98.8% (2347) | 98.9% (1452) | | Truck-related (T) | 2.9% (466) | 1.2% (28) | 1.1% (16) |
| | Road | No. of lanes (NL) | <=2 | 20.0% (3218) | 13.1% (312) | 23.8% (350) | | >2 | 80.0% (12880) | 86.9% (2063) | 76.2% (1118) | | Speed Limit (SL) | <=40 | 50.9% (8188) | 58.0% (1377) | 39.2% (576) | | >40 | 49.1% (7910) | 42.0% (998) | 60.8% (892) | | Terrain (TR) | Flat (F) | 6.9% (1118) | 9.1% (215) | 3.7% (54) | | Not flat (NF) | 93.1% (14980) | 90.9% (2160) | 96.3% (1414) | | Operation (OP) | One-way | 0.8% (124) | 0.7% (16) | 0.3% | | Two-way | 99.2% (15974) | 99.3% (2359) | 99.7% (1464) |
| | Environment | Traffic control device (TCD) | At control (AC) | 66.65% (10729) | 68.67% (1631) | 62.36% (918) | | Not at control (NAC) | 33.35% (5369) | 31.33% (744) | 37.64% (554) | | Location (LC) | Along Roadway (AR) | 41.4% (6662) | 27.0% (641) | 46.9% (688) | | At an Intersection (AI) | 58.6% (9436) | 73.0% (1734) | 53.1% (780) | | Date of Crash | Other months (OM) | 59.4% (9566) | 77.9% (1849) | 78.2% (1148) | | Summer vacation (SV) | 40.6% (6532) | 22.1% (526) | 21.8% (320) | | Weather condition (WC) | Clear (C) | 90.6% (14592) | 85.7% (2035) | 80.8% (1186) | | Not clear (NC) | 9.4% (1506) | 14.3% (340) | 19.2% (282) | | Relation to first roadway (RFR) | Off roadway (OR) | 4.7% (752) | 10.6% (252) | 20.0% (294) | | On roadway (OR) | 95.3% (15346) | 89.4% (2123) | 80.0% (1174) | | Urban or rural (UR) | Rural (R) | 15.8% (2538) | 1.7% (40) | 28.6% (420) | | Urban (U) | 84.2% (13560) | 98.3% (2335) | 71.4% (1048) | | Manner of first collision (MFC) | Head-on (HO) | 2.2% (358) | 7.6% (181) | 6.8% (100) | | Not-head-on (NHO) | 97.8% (15740) | 92.4% (2194) | 93.2% (1368) |
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