Research Article
Do Expressway Interchanges Increase Crash Injury Severities? Insights Using Temporal Instability and Unobserved Heterogeneity
Table 1
Crash observations for IAC and NIAC across 2017–2019.
| Year | Classification | No injury | Minor injury | Severe injury | Total |
| 2017 | IAC | 150 | 51 | 23 | 224 | NIAC | 1029 | 331 | 39 | 1399 |
| 2018 | IAC | 149 | 48 | 12 | 209 | NIAC | 1218 | 399 | 58 | 1675 |
| 2019 | IAC | 154 | 37 | 6 | 197 | NIAC | 1164 | 315 | 21 | 1500 |
| 2017–2019 | IAC | 453 | 136 | 41 | 630 | NIAC | 3411 | 1045 | 118 | 4574 |
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