Crash Frequency Minimization with Severity Mitigation in Road Geometric Design Using Chance Constraint Programming Optimization

Table 11

Computational results of models for 1–3 pm and 3:30–5:30 pm time segments.

Time segment	Reliability level	, number of standard deviations from mean speed (percentile)
		High speed and high severity				Low speed and low severity
		−3	−2	−1	0		1	2	3
		(0.1%)	(2.2%)	(15.8%)	(50%)		(84.1%)	(97.7%)	(99.9%)
1–3 pm	0.5	0.08670	0.08670	0.08670	0.09259		0.09259	0.19312	Infeasible
	0.6	0.08670	0.08670	0.08670	0.09259		0.09259	0.21410	Infeasible
	0.7	0.08670	0.08670	0.08670	0.09259		0.10004	0.23528	Infeasible
	0.8	0.08670	0.08670	0.08670	0.09259		0.10794	0.26316	Infeasible
	0.9	0.08670	0.08670	0.08670	0.09259		0.10847	0.29785	Infeasible
	1	0.08670	0.08670	0.08670	0.09259		0.11592	0.38713	Infeasible
3:30–5:30 pm	0.5	0.08670	0.08670	0.08670	0.09259		0.09259	0.18508	Infeasible
	0.6	0.08670	0.08670	0.08670	0.09259		0.09259	0.22457	Infeasible
	0.7	0.08670	0.08670	0.08670	0.09259		0.09259	Infeasible	Infeasible
	0.8	0.08670	0.08670	0.08670	0.09259		0.09860	Infeasible	Infeasible
	0.9	0.08670	0.08670	0.08670	0.09259		0.10608	Infeasible	Infeasible
	1	0.08670	0.08670	0.08670	0.09259		0.18976	Infeasible	Infeasible