Analysis of Freeway Safety Influencing Factors on Driving Workload and Performance Based on the Gray Correlation Method

Table 1

MANOVA results for subjective workload and driving performance.

Source	Indicators	Type III sum of squares	df	Mean square	F	Sig.
Radius	Workload	5859.036	3	1953.012	8.798	0.000
	Mean of speed	21576.295	3	7192.098	37.471	0.000
	Variance of speed	372.335	3	124.112	5.876	0.001
	Mean of lane deviation	3.001	3	1.000	22.646	0.000
	Variance of lane deviation	5.515	3	1.838	53.026	0.000
Grade	Workload	10812.170	3	3604.057	16.235	0.000
	Mean of speed	3626.594	3	1208.865	6.298	0.000
	Variance of speed	342.024	3	114.008	5.398	0.001
	Mean of lane deviation	.019	3	0.006	0.141	0.935
	Variance of lane deviation	.457	3	0.152	4.394	0.004
Flow	Workload	2917.339	3	972.446	4.380	0.005
	Mean of speed	3093.921	3	1031.307	5.373	0.001
	Variance of speed	595.479	3	198.493	9.398	0.000
	Mean of lane deviation	.081	3	0.027	0.612	0.607
	Variance of lane deviation	.081	3	0.027	0.779	0.506
Sign information	Workload	40714.972	3	13571.657	61.135	0.000
	Mean of speed	2248.253	3	749.418	3.905	0.009
	Variance of speed	175.308	3	58.436	2.767	0.041
	Mean of lane deviation	.148	3	0.049	1.116	0.342
	Variance of lane deviation	.473	3	0.158	4.548	0.004