Evaluation of the Rain Effects on Gap Acceptance Behavior at Roundabouts by a Logit Model

Table 2

Critical and follow-up headways values in previous studies.

Study name	Country	Critical Gap; (Sec.)	Follow-up headway; (Sec.)
Abdullah Ahmad	India	2.5 ~ 3.0	-
Abrams et al.	US	2.20	-
Brilon	Germany	4.07 ~ 4.45	2.89 ~ 2.99
Cheng Jie	China	4.1 ~ 5.4	-
Dahl & Lee	Canada	3.90 ~ 5.30	2.10 ~ 4.20
Feng Xu	US	4.5 ~ 5.3	-
Fortuijn	The Netherlands	3.16 ~ 3.28	2.10
Gazzarri et al.	Italy	3.54 ~ 4.10	2.52 ~ 2.76
Guo Ruijun	China	2.7	-
HCM (2010)	US	4.1	-
Iraj Bargego	Iran	2.52 ~ 4.03	-
KHCM (2013)	South Korea	3.21	-
Kim, T	South Korea	2.42 ~ 2.7	-
Liang Ren	Australia	4.6 ~ 4.8	-
Mensah S. el al.	US	2.50 ~ 2.60	-
NCHRP (3-65)	US	4.2 ~ 5.9	-
Nicolosi et al.	Italy	3.19 ~ 3.99	3.15 ~ 2.11
Park, S	South Korea	3.7 ~ 4.1	-
Qu X et al.	Australia	-	-
Rodegerdts et al.	US	3.90 ~ 5.90	2.60 ~ 4.30
Shweta Rao	India	1.36 ~ 2.52	-
Vasconcelos et al.	Portugal	3.23 ~ 4.50	-
Vasconcelos et al.	Portugal	3.37 ~ 4.28	2.08 ~ 2.20
Wu	Germany	4.12	2.88
Xu & Tian	US	4.50 ~ 5.30	2.30 ~ 2.80
Zheng et al.	US	3.80 ~ 5.50	2.30 ~ 3.80

Sources: [27–37].