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