Drivers'workload is measured at sites with promise on National Highway 109 Ning Xia HUI au- tonomous region section through eye tracking,heart rate(HR),breath and skin resistance (SR) from the driver's psycho-physical aspect.The main purpose is to quantitatively analyze and compare the workload be- tween ordinary segment (on straight line segment) and at sites with promise (on high radius curve and urban- ized intersection),and then to evaluate the effect of safety improvement and give efficient suggestions...