Effects of weather conditions, light conditions, and road lighting on vehicle speed

Jägerbrand, Annika K.; Sjöbergh, Jonas

doi:10.1186/s40064-016-2124-6

SpringerPlus

Table 7 Roads with road lighting

From: Effects of weather conditions, light conditions, and road lighting on vehicle speed

Weather condition	PSL	Darkness–twilight		Darkness–daylight		Twilight–daylight
TF no.	(km/h)	(km/h)	(%)	(km/h)	(%)	(km/h)	(%)
Clear
9690	30	1.9	6.4	2.9	9.5	0.9	3.2
7440	50	1.0	2.1	0.3	0.6	−0.8	−1.5
7460	50	0.3	0.6	−0.3	−0.6	−0.6	−1.2
9539	50	0.2	0.4	2.2	4.4	2.0	4.0
9620	50	−0.2	−0.3	0.1	0.2	0.2	0.5
9697	50	0.6	1.2	−0.1	−0.3	−0.7	−1.4
2030	60	1.8	3.1	1.9	3.2	0.1	0.1
9019	60	2.0	3.3	0.4	0.7	−1.5	−2.6
9402	60	0.3	0.5	1.7	2.8	1.3	2.2
7310	70	1.4	2.0	−0.2	−0.3	−1.6	−2.3
7450	70	1.9	2.8	1.0	1.4	−0.9	−1.3
9945	70	1.3	1.8	1.2	1.6	−0.1	−0.1
2046	90	−2.4	−2.7	−1.0	−1.1	1.4	1.6
9876	90	−0.8	−0.9	−2.6	−2.9	−1.7	−1.9
7340	100	2.3	2.3	0.6	0.6	−1.7	−1.7
9613	110	−1.4	−1.3	−0.8	−0.7	0.6	0.6
9614	110	−2.1	−1.9	−2.0	−1.8	0.1	0.1
Mean		0.5	1.1	0.3	1.0	−0.2	−0.1
Rain
9690	30	1.5	4.9	2.3	7.8	0.9	2.9
7440	50	0.6	1.1	0.1	0.1	−0.5	−1.0
7460	50	0.5	1.1	0.0	0.0	−0.6	−1.1
9539	50	−0.6	−1.1	2.2	4.4	2.8	5.6
9620	50	0.2	0.4	−0.2	−0.4	−0.4	−0.7
9697	50	0.3	0.7	−0.1	−0.2	−0.4	−0.9
2030	60	3.0	5.0	2.4	4.1	−0.6	−1.0
9019	60	1.5	2.5	1.4	2.3	−0.1	−0.2
9402	60	−1.0	−1.7	0.6	1.1	1.7	2.8
7310	70	1.8	2.5	−0.7	−0.9	−2.4	−3.5
7450	70	1.2	1.8	1.4	2.0	0.2	0.3
9945	70	−1.7	−2.4	0.1	0.1	1.7	2.5
2046	90	−4.2	−4.7	−3.8	−4.2	0.4	0.4
9876	90	−2.2	−2.5	−4.5	−5.0	−2.3	−2.5
7340	100	3.7	3.7	0.4	0.4	−3.3	−3.3
9613	110	−0.3	−0.3	−2.1	−1.9	−1.8	−1.6
9614	110	−1.4	−1.3	−3.0	−2.7	−1.6	−1.4
Mean		0.2	0.6	−0.2	0.4	−0.4	−0.2
Snow
9690	30	2.6	8.8	1.6	5.5	−1.0	−3.3
7440	50	2.7	5.3	−0.5	−1.1	−3.2	−6.4
7460	50	1.4	2.7	−0.9	−1.8	−2.3	−4.5
9539	50	−1.5	−3.0	0.3	0.5	1.8	3.5
9620	50	1.3	2.7	0.4	0.7	−1.0	−2.0
9697	50	1.0	2.1	−1.5	−2.9	−2.5	−5.0
2030	60	3.4	5.7	2.1	3.5	−1.3	−2.1
9019	60	3.4	5.7	−0.3	−0.5	−3.7	−6.2
9402	60	−2.3	−3.9	−0.5	−0.8	1.9	3.1
7310	70	1.9	2.7	0.2	0.3	−1.7	−2.4
7450	70	3.5	5.0	0.0	−0.1	−3.5	−5.0
9945	70	3.2	4.6	2.5	3.6	−0.7	−1.0
2046	90	−4.2	−4.7	−2.4	−2.7	1.8	2.0
9876	90	−1.1	−1.2	−1.2	−1.3	−0.1	−0.1
7340	100	1.3	1.3	−0.5	−0.5	−1.8	−1.8
9613	110	0.1	0.1	−5.2	−4.7	−5.3	−4.9
9614	110	−2.2	−2.0	−7.4	−6.7	−5.2	−4.7
Mean		0.9	1.9	−0.8	−0.5	−1.6	−2.4

Average speed differences (km/h) and percentage average speed difference in relation to posted speed limit (%) per road (TF no.) between light condition groups (darkness, daylight, twilight) and divided by weather conditions (clear, rain, snow)
TF no. TF number (identification number for roads), see Tables 1 and 2, PSL posted speed limit. Mean values shown per weather condition group

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