An Experimental Study on Lateral Acceleration of Cars in Different Environments in Sichuan, Southwest China

Table 1

Key technical parameters of surveyed roadways.

Number	Technical grade	Design speed (km/h)	Pavement width (m)	Shoulder width (m)	Median separator	Terrain	Roadway length (m)	Min. curve radii (m)	Max/Min grade (%)	Number of drivers	Pavement condition
1	Expressway	120	16	3.5	Yes	Chengdu Plain	28258	650	−3%~3%	4	Dry/regularity	Six lanes
2	Expressway	100	15	3	Yes	Chengdu Plain	26317	400	−4%~4%	3	Dry/regularity
3	First-class road	80	14	2	Yes	Chengdu Plain	32758	250	−4%~4%	3	Dry/regularity
4	Expressway	100	11	2.5	Yes	Chengdu Plain	18141	400	−4%~4%	3	Dry/regularity	Four lanes
5	Expressway	100	11	2.5	Yes	Hill	91942	400	−4%~4%	5	Wet/regularity
6	Expressway	80	10	2	Yes	Hill/mountain	41081	250	−5%~5%	5	Dry/regularity
7	Second-class road	60	10	1.5	No	Chengdu Plain	30828	200	−5%~5%	2	Dry/regularity	Two lanes
8	Second-class road	60	10	1.5	No	Hill	21873	125	−6%~6%	3	Dry/regularity
9	Second-class road	40	8	0.5	No	Mountain ridge	39638	60	−7%~7%	3	Dry/regularity
10	Tertiary highway	30	7	0.25	No	Mountain ridge	38845	30	−8%~8%	3	Wet/regularity
11	Tertiary highway	30	8	0.8	No	Mountain ridge	32383	30	−8%~8%	3	Dry/regularity
12	Fourth-class road	20	6	0	No	Mountain ridge	17838	15	−9%~9%	3	Dry/regularity