Model of Driver’s Eye Movement and ECG Index under Tunnel Environment Based on Spatiotemporal Data

Table 4

Time- and frequency-domain indicators of the driver’s heart rate variability.

Items	Freeway		Tunnel
	Mean	Sd	Mean	Sd
MEAN	0.732	0.116	0.683	0.112
SDNN	0.052	0.043	0.067	0.076
RMSSD	0.062	0.092	0.082	0.101
SDSD	0.037	0.050	0.065	0.087
HF	0.821	0.095	0.797	0.078
LF	0.179	0.090	0.206	0.078
LF/HF	0.218	0.156	0.258	1.580