|
Variable | 2017 | 2018 | 2019 |
IAC | NIAC | IAC | NIAC | IAC | NIAC |
|
Driver characteristics |
Safety (1 if speeding, 0 otherwise) | 0.820 (0.379) | 0.734 (0.442) | 0.880 (0.325) | 0.690 (0.462) | 0.481 (0.500) | 0.422 (0.494) |
Safety (1 if improper action, 0 otherwise) | 0.126 (0.241) | 0.238 (0.426) | 0.120 (0.325) | 0.305 (0.461) | 0.516 (0.500) | 0.577 (0.494) |
|
Vehicle characteristics |
Vehicle indicator (1 if the number of vehicles involved in the crash is 1, 0 otherwise) | 0.503 (0.499) | 0.619 (0.486) | 0.389 (0.488) | 0.470 (0.499) | 0.222 (0.415) | 0.453 (0.498) |
Vehicle indicator (1 if the number of vehicles involved in the crash is 2, 0 otherwise) | 0.425 (0.496) | 0.328 (0.470) | 0.526 (0.500) | 0.448 (0.497) | 0.655 (0.476) | 0.466 (0.499) |
Vehicle indicator (1 if the number of vehicles involved in the crash is > 2, 0 otherwise) | 0.072 (0.315) | 0.053 (0.224) | 0.086 (0.280) | 0.082 (0.274) | 0.123 (0.329) | 0.082 (0.274) |
Vehicle type (1 if passenger car, 0 otherwise) | 0.353 (0.522) | 0.326 (0.516) | 0.350 (0.478) | 0.384 (0.509) | 0.326 (0.454) | 0.365 (0.514) |
Vehicle type (1 if minibus, 0 otherwise) | 0.372 (0.582) | 0.380 (0.596) | 0.411 (0.670) | 0.504 (0.565) | 0.444 (0.506) | 0.352 (0.350) |
Vehicle type (1 if bus, 0 otherwise) | 0.123 (0.325) | 0.009 (0.096) | 0.057 (0.232) | 0.029 (0.169) | 0.003 (0.056) | 0.016 (0.125) |
Vehicle type (1 if van, 0 otherwise) | 0.037 (0.168) | 0.002 (0.041) | 0.017 (0.130) | 0.013 (0.113) | 0.009 (0.097) | 0.006 (0.074) |
Vehicle type (1 if truck, 0 otherwise) | 0.125 (0.241) | 0.051 (0.221) | 0.137 (0.344) | 0.182 (0.386) | 0.481 (0.500) | 0.471 (0.499) |
Vehicle type (1 if heavy truck, 0 otherwise) | 0.090 (0.189) | 0.047 (0.212) | 0.360 (0.480) | 0.256 (0.436) | 0.009 (0.097) | 0.025 (0.156) |
|
Roadway characteristics |
: radius of the plane curve of front section (103 m) | 227.067 (442.562) | 457.565 (494.325) | 220.402 (316.263) | 481.521 (495.938) | 280.408 (443.770) | 424.397 (490.117) |
: radius of the horizontal curve (103 m) | 476.616 (497.219) | 326.923 (464.013) | 517.533 (496.929) | 332.438 (466.003) | 431.369 (491.346) | 389.388 (483.171) |
radius of the plane curve of back section (103 m) | 286.600 (476.896) | 464.218 (494.944) | 334.140 (417.280) | 470.771 (495.394) | 353.047 (418.818) | 343.797 (425.888) |
: length of the plane curve of front section (103 m) | 0.943 (0.734) | 1.248 (0.711) | 0.770 (0.469) | 1.276 (0.727) | 1.394 (0.756) | 1.448 (0.705) |
: length of the horizontal curve (103 m) | 1.356 (0.589) | 1.631 (0.657) | 1.312 (0.551) | 1.671 (0.608) | 1.291 (0.689) | 1.449 (0.759) |
: length of the plane curve of back section (103 m) | 0.906 (0.622) | 1.269 (0.757) | 0.801 (0.486) | 1.257 (0.747) | 1.234 (0.712) | 1.449 (0.759) |
: minimum longitudinal grade of current section (%) | 0.011 (0.486) | 0.107 (3.219) | 0.039 (0.557) | 0.018 (0.432) | 0.014 (0.428) | 0.021 (0.415) |
: length of the longitudinal slope corresponding to the minimum grade (m) | 675.024 (274.427) | 750.991 (274.959) | 669.874 (250.212) | 747.066 (277.276) | 711.898 (322.849) | 354.359 (396.518) |
: maximum longitudinal grade of current section (%) | 0.034 (1.215) | 0.103 (1.422) | 0.072 (1.206) | 0.062 (1.100) | 0.075 (1.034) | 0.078 (1.205) |
: length of the longitudinal slope corresponding to the maximum grade (m) | 644.096 (244.602) | 619.512 (237.251) | 648.509 (146.288) | 605.182 (225.170) | 481.942 (156.365) | 523.322 (40.203) |
|
Environmental characteristics |
Weather (1 if fine, 0 otherwise) | 0.324 (0.375) | 0.329 (0.381) | 0.193 (0.338) | 0.124 (0.330) | 0.272 (0.445) | 0.273 (0.445) |
Weather (1 if cloudy, 0 otherwise) | 0.383 (0.399) | 0.337 (0.425) | 0.331 (0.471) | 0.379 (0.485) | 0.658 (0.475) | 0.585 (0.493) |
Weather (1 if rainy, 0 otherwise) | 0.174 (0.458) | 0.250 (0.409) | 0.326 (0.469) | 0.361 (0.480) | 0.051 (0.219) | 0.085 (0.279) |
Weather (1 if foggy, 0 otherwise) | 0.054 (0.299) | 0.023 (0.149) | 0.097 (0.296) | 0.042 (0.201) | 0.009 (0.097) | 0.026 (0.159) |
Weather (1 if snowy, 0 otherwise) | 0.054 (0.156) | 0.061 (0.239) | 0.051 (0.221) | 0.068 (0.252) | 0.016 (0.125) | 0.036 (0.187) |
Road surface condition (1 if icy, 0 otherwise) | 0.012 (0.111) | 0.019 (0.138) | 0.017 (0.130) | 0.034 (0.181) | 0.015 (0.180) | 0.016 (0.131) |
|
Temporal characteristics |
Monday (1: occurs on Monday, otherwise 0) | 0.138 (0.368) | 0.113 (0.317) | 0.080 (0.272) | 0.116 (0.320) | 0.098 (0.298) | 0.122 (0.327) |
Tuesday (1: occurs on Tuesday, otherwise 0) | 0.126 (0.330) | 0.118 (0.323) | 0.103 (0.304) | 0.110 (0.313) | 0.146 (0.353) | 0.136 (0.343) |
Wednesday (1: occurs on Wednesday, otherwise 0) | 0.162 (0.379) | 0.138 (0.345) | 0.183 (0.387) | 0.129 (0.335) | 0.130 (0.336) | 0.119 (0.324) |
Thursday (1: occurs on Thursday, otherwise 0) | 0.198 (0.330) | 0.167 (0.373) | 0.183 (0.387) | 0.180 (0.384) | 0.161 (0.368) | 0.137 (0.344) |
Friday (1: occurs on Friday, otherwise 0) | 0.120 (0.343) | 0.155 (0.362) | 0.149 (0.356) | 0.172 (0.377) | 0.165 (0.371) | 0.171 (0.376) |
Saturday (1: occurs on Saturday, otherwise 0) | 0.144 (0.330) | 0.178 (0.382) | 0.131 (0.338) | 0.156 (0.363) | 0.171 (0.377) | 0.186 (0.390) |
Sunday (1: occurs on Sunday, otherwise 0) | 0.114 (0.368) | 0.131 (0.337) | 0.171 (0.377) | 0.138 (0.345) | 0.130 (0.336) | 0.129 (0.335) |
Early morning (1: occurs from 00 : 00 to 05 : 59, otherwise 0) | 0.467 (0.498) | 0.485 (0.500) | 0.211 (0.409) | 0.247 (0.431) | 0.310 (0.463) | 0.276 (0.447) |
Morning (1: occurs from 6 : 00 to 11 : 59, otherwise 0) | 0.198 (0.389) | 0.180 (0.384) | 0.349 (0.477) | 0.278 (0.448) | 0.212 (0.409) | 0.248 (0.432) |
Afternoon (1: occurs from 12 : 00 to 17 : 59, otherwise 0) | 0.198 (0.399) | 0.216 (0.411) | 0.246 (0.431) | 0.290 (0.454) | 0.288 (0.453) | 0.295 (0.456) |
Evening (1: occurs from 18 : 00 to 23 : 59, otherwise 0) | 0.138 (0.379) | 0.120 (0.325) | 0.194 (0.396) | 0.185 (0.389) | 0.190 (0.392) | 0.182 (0.386) |
Spring (1: occurs in spring, otherwise, 0) | 0.246 (0.262) | 0.266 (0.442) | 0.440 (0.497) | 0.346 (0.476) | 0.320 (0.365) | 0.207 (0.405) |
Summer (1: occurs in summer, otherwise, 0) | 0.246 (0.472) | 0.219 (0.414) | 0.234 (0.424) | 0.213 (0.410) | 0.263 (0.244) | 0.284 (0.348) |
Autumn (1: occurs in autumn, otherwise, 0) | 0.281 (0.468) | 0.277 (0.448) | 0.200 (0.400) | 0.254 (0.435) | 0.279 (0.270) | 0.305 (0.317) |
Winter (1: occurs in winter, otherwise, 0) | 0.228 (0.446) | 0.237 (0.425) | 0.126 (0.332) | 0.188 (0.390) | 0.138 (0.191) | 0.204 (0.315) |
|
Traffic characteristics |
Bridge (1: the section occurring is the bridge section, otherwise 0) | 0.305 (0.439) | 0.287 (0.452) | 0.269 (0.444) | 0.278 (0.448) | 0.244 (0.430) | 0.267 (0.443) |
AADT: Average annual daily traffic volume | 45634.6 (9917.2) | 52156.030 (11215.396) | 45110.6 (9096.3) | 53365.1 (10855.6) | 50261.0 (11469.3) | 52496.4 (10851.5) |
|
Crash characteristics |
Sideswipe (1: the crash type is sideswipe, otherwise 0) | 0.006 (0.111) | 0.004 (0.065) | 0.011 (0.106) | 0.020 (0.140) | 0.013 (0.112) | 0.014 (0.117) |
Run-off-road (1: the crash type is run-off-road, otherwise 0) | 0.036 (0.111) | 0.056 (0.231) | 0.057 (0.232) | 0.055 (0.229) | 0.028 (0.166) | 0.063 (0.243) |
Overturned (1: the crash type is overturned, otherwise 0) | 0.012 (0.156) | 0.002 (0.041) | 0.000 (0.000) | 0.002 (0.046) | 0.000 (0.000) | 0.000 (0.000) |
Hit fixed object (1: the crash type is hit fixed object, otherwise 0) | 0.275 (0.299) | 0.281 (0.449) | 0.269 (0.444) | 0.324 (0.468) | 0.255 (0.362) | 0.311 (0.463) |
Rear-end (1: the crash type is rear-end, otherwise 0) | 0.401 (0.477) | 0.264 (0.441) | 0.362 (0.461) | 0.304 (0.492) | 0.350 (0.433) | 0.493 (0.500) |
Other crash types (1: other crash types, otherwise 0) | 0.269 (0.500) | 0.393 (0.488) | 0.301 (0.452) | 0.298 (0.490) | 0.360 (0.438) | 0.125 (0.331) |
Crash indicator (1 if flat-tire, 0 otherwise) | 0.006 (0.111) | 0.006 (0.077) | 0.000 (0.000) | 0.000 (0.000) | 0.003 (0.056) | 0.001 (0.030) |
Crash indicator (1 if mechanical fault, 0 otherwise) | 0.000 (0.000) | 0.002 (0.041) | 0.000 (0.000) | 0.002 (0.046) | 0.000 (0.000) | 0.000 (0.000) |
EMS shorter than 20 minutes (1: rescue response time is shorter than 20 minutes, otherwise 0) | 0.048 (0.189) | 0.055 (0.228) | 0.034 (0.182) | 0.038 (0.191) | 0.006 (0.079) | 0.020 (0.141) |
EMS among 20–60 minutes (1: rescue response time is 20–60 minutes, otherwise 0) | 0.557 (0.501) | 0.564 (0.496) | 0.600 (0.490) | 0.544 (0.498) | 0.152 (0.359) | 0.264 (0.441) |
EMS greater than 60 minutes (1: rescue response time greater than 60 minutes, otherwise 0) | 0.395 (0.500) | 0.381 (0.486) | 0.366 (0.482) | 0.418 (0.493) | 0.842 (0.365) | 0.715 (0.451) |
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