Evaluation of Roundabout Safety Performance through Surrogate Safety Measures from Microsimulation

Table 6

Normalised total conflicts at roundabouts.

case	Filter	Single-Lane Roundabout		Double-Lane Roundabout		Turbo Roundabout
		SSAM-AIMSUN	SSAM-VISSIM	SSAM-AIMSUN	SSAM-VISSIM	SSAM-AIMSUN	SSAM-VISSIM
case a	DEFAULT	87.56	69.53	102.70	63.56	127.03	9.21
	FILTER	1.68	1.38	7.79	4.10	1.37	4.30
case b	DEFAULT	76.82	67.25	98.07	49.55	227.80	26.16
	FILTER	0.93	1.03	6.65	11.83	2.48	3.79
case c	DEFAULT	65.53	42.41	81.04	39.98	48.37	28.41
	FILTER	1.42	1.52	6.03	3.69	0.89	4.87

Note: o-d matrixes in Table 5; the mean values of the normalised total conflicts calculated using the TRJ.files generated by AIMSUN both when the default filters of the SSAM were not changed and when the appropriate filters were applied; the mean values of the normalised total conflicts calculated using the TRJ.files generated by VISSIM when the default filters of SSAM were not changed and when the appropriate filters were applied.