An Improved Car-Following Speed Model considering Speed of the Lead Vehicle, Vehicle Spacing, and Driver’s Sensitivity to Them

Table 8

Summary of model validation results.

Performance criterion		Proposed model	Helbing-Tilch model	Yang et al. model
MRE	Min	3.30%	6.12%	5.93%
	1^st quartile	8.21%	35.61%	18.79%
	Mean	10.23%	45.24%	29.31%
	3^rd quartile	12.62%	45.76%	33.09%
	Max	13.77%	55.57%	41.75%
RMSE	Min	2.1133	2.7332	2.5181
	1^st quartile	3.9662	12.2857	8.1394
	Mean	4.7625	16.8212	10.8330
	3^rd quartile	5.2657	17.6351	12.5353
	Max	5.9414	22.2920	15.4097
EC	Min	0.6300	0.3087	0.3054
	1^st quartile	0.9135	0.6231	0.7617
	Mean	0.9330	0.7107	0.8353
	3^rd quartile	0.9255	0.6951	0.8084
	Max	0.9473	0.7753	0.8816