Gap-accepteance parameters for roundabouts: a systematic review

European Transport Research Review

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Table 3 Critical and follow-up headways values for turbo roundabouts

study name	country	entry	entry lane	circulating lane	critical headway
					mean [s]		st. deviation [s]
					min	max	min	max
Brilon et al. [39]	Germany	major	left		4.50	-	-	-
Fortuijn [44]	The Netherlands	major	left		3.37	3.72	0.36	0.95
Brilon et al. [39]	Germany	major	right		4.50	-	-	-
Fortuijn [44]	The Netherlands	major	right		3.67	4.17	0.85	1.59
Brilon et al. [39]	Germany	minor	left	inner	4.00	-	-	-
		minor	left	outer	4.50	-	-	-
Fortuijn [44]	The Netherlands	minor	left	inner	3.15	3.24	0.27	0.47
		minor	left	outer	2.79	3.42	0.50	0.80
Brilon et al. [39]	Germany	minor	right	outer	4.50	-	-	-
Fortuijn [44]	The Netherlands	minor	right	outer	3.37	4.93	0.51	2.28