The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts

Table 3

Wisconsin DOT freeway model calibration criteria.

Criteria and Measures	Traffic Flow range	Calibration Acceptance Targets
Individual Link Flows
Within 15%	700veh/h<Flow<2700veh/h	>85%of cases
Within 100veh/h	Flow<700veh/h	>85%of cases
Within 400veh/h	Flow>2700veh/h	>85%of cases
Sum of All Link Flows	Within 5%of sum of all link counts
GEH statistic<5 for Individual link Flow	>85%of cases
GEH statistic<5 for all link Flow		GEH<4 for sum of all link counts
Travel times, Model Versus Observed
Journay Time, Network Within 15%(or 1min if higher)		>85%of cases
Visual Adults
Individual Link Speeds-visually Acceptable Speed-Flow relationship		To analyst’s satisfaction
Bottlenecks
Visually Acceptable Queuing		To analyst’s satisfaction