Predicting Operating Speeds at Urban Multilane Roundabouts in Abu Dhabi, United Arab Emirates

Table 2

Observed 85th percentile operating speeds.

Site	Day 1			Day 2			Day 3			Day 4			Mean	Std. Dev.	Speed Limit
	1 (Entry)	26.7	32.4	29.7	25.4	33.1	30.6	28.8	34.5	31.2	27.4	33.7				32.9	30.5	2.8	40
1 (Circ.)	30.4	36.1	32.8	32.5	38.9	34.7	35.1	40.2	38.6	34.4	41.5	37.6	36.1	3.2	40
1 (Exit)	32.4	37.1	33.6	33.5	41.2	36.5	38.2	44.2	41.0	36.9	40.1	34.5	37.4	3.5	40
2 (Entry)	28.7	33.1	30.4	29.6	34.8	33.2	32.2	35.8	33.6	36.2	39.5	37.4	33.7	3.1	40
2 (Circ.)	33.2	36.8	35.2	35.1	38.6	37.4	34.7	39.2	37.4	30.2	33.2	31.8	35.2	2.7	40
2 (Exit)	37.9	41.2	40.5	38.9	36.1	35.7	36.8	42.5	39.7	34.7	36.5	33.9	37.9	2.6	40
3 (Entry)	40.6	43.2	44.8	41.5	45.6	46.7	41.2	44.7	48.3	40.1	42.5	46.7	43.8	2.6	50
3 (Circ.)	42.3	44.1	45.2	40.8	44.3	43.8	40.1	42.7	46.0	39.7	41.4	44.8	42.9	2.0	50
3 (Exit)	45.2	47.5	48.1	46.8	48.5	44.3	43.2	44.4	48.9	41.1	40.1	42.8	45.1	2.8	50
4 (Entry)	44.7	48.3	50.1	43.9	46.2	44.5	47.2	46.1	50.3	48.3	50.7	51.6	47.7	2.5	50
4 (Circ.)	46.0	49.3	51.2	44.5	45.6	48.7	49.1	45.5	51.1	48.3	52.5	54.6	48.9	3.0	50
4 (Exit)	48.3	52.1	53.4	48.7	46.3	50.7	53.4	48.9	52.7	49.3	54.6	55.8	51.2	2.8	50
5 (Entry)	28.4	33.4	31.8	29.6	34.8	33.5	33.0	34.7	32.6	37.1	30.4	31.9	32.6	2.3	40
5 (Circ.)	32.4	34.5	33.6	30.1	36.7	39.5	34.8	35.0	34.6	38.7	31.2	33.6	34.6	2.6	40
5 (Exit)	34.5	36.8	38.7	31.5	36.9	41.2	37.0	36.4	35.9	40.1	33.5	39.7	36.9	2.7	40
6 (Entry)	39.8	44.5	43.6	41.8	48.6	45.7	42.3	44.5	48.7	45.0	47.8	43.2	44.6	2.6	50
6 (Circ.)	42.6	48.7	44.6	47.6	47.6	46.9	44.3	47.8	50.2	47.8	49.6	51.3	47.4	2.4	50
6 (Exit)	44.7	51.8	46.3	52.7	53.2	51.4	45.3	48.2	51.4	48.9	52.3	53.7	50.0	3.1	50
7 (Entry)	42.1	48.9	44.6	50.2	51.3	50.8	44.6	47.9	50.7	49.3	50.7	51.2	48.5	3.0	40
7 (Circ.)	44.6	51.2	47.9	53.0	53.4	51.7	48.9	49.0	53.6	51.4	53.2	54.8	51.1	2.8	40
7 (Exit)	46.9	53.8	49.1	55.3	56.8	53.7	51.2	49.8	55.6	52.3	55.4	57.8	53.1	3.2	40
8 (Entry)	39.7	37.4	38.1	36.5	34.1	33.8	32.8	33.9	34.7	30.8	32.5	33.6	34.8	2.5	40
8 (Circ.)	37.1	34.2	33.3	36.1	30.2	29.8	28.7	26.9	27.8	28.6	30.7	27.4	30.9	3.3	40
8 (Exit)	38.3	35.4	31.9	37.5	31.6	32.1	29.4	27.8	28.6	29.0	33.1	28.5	31.9	3.4	40
9 (Entry)	36.1	31.5	33.8	35.6	34.7	30.8	29.7	28.4	27.3	26.8	27.0	28.6	30.9	3.3	40
9 (Circ.)	35.1	34.6	33.7	33.6	32.7	30.1	31.4	28.4	27.6	26.8	27.8	26.3	30.7	3.1	40
9 (Exit)	34.8	35.6	34.1	33.2	33.1	28.9	29.7	28.7	29.0	31.0	30.8	27.4	31.4	2.6	40
10 (Entry)	36.1	37.4	38.0	35.3	33.8	34.7	33.1	34.8	36.0	30.1	31.2	33.2	34.5	2.2	40
10 (Circ.)	37.0	39.1	40.1	37.4	35.0	36.7	34.1	33.8	39.8	30.8	32.4	33.9	35.8	2.9	40
10 (Exit)	40.1	41.2	43.6	39.8	38.6	37.8	39.0	34.7	42.5	33.6	37.4	36.9	38.8	2.8	40
11 (Entry)	32.1	29.7	28.6	28.4	27.0	26.9	30.4	31.2	28.6	30.7	33.1	31.8	29.9	1.9	40
11 (Circ.)	34.8	35.6	38.1	40.2	39.8	41.5	38.6	42.3	41.8	36.9	42.7	41.6	39.5	2.6	40
11 (Exit)	39.6	42.3	44.7	46.9	47.2	44.3	40.8	45.6	43.6	39.6	45.7	44.0	43.7	2.5	40
12 (Entry)	38.4	37.6	41.0	45.6	44.2	40.8	41.2	44.3	42.1	38.6	37.6	39.0	40.9	2.6	40
12 (Circ.)	39.1	40.2	43.6	44.2	43.8	41.3	42.9	41.7	43.0	39.6	38.5	41.0	41.6	1.9	40
12 (Exit)	44.2	45.3	46.8	47.2	45.0	43.6	47.2	44.3	45.6	47.6	41.2	43.1	45.1	1.9	40