Driving Safety Assurance Method in Work Zone Crossovers of Highway Reconstruction and Expansion Project

Table 1

Traffic flow data about different construction sites.

Construction sites	Traffic organization	Headway (s)		Speed (km/h)
		Mean	Variance	Mean	Variance
Subgrade widened	Compress right lane	5.63	5.06	78.08	10.77
Bridge widened	Closed shoulder	8.98	7.65	76.82	10.54
One direction closed	Work zone crossover	10.43	8.86	66.46	10.98
Subgrade left	Closed shoulder	5.20	4.36	75.33	9.88
Construction overpass	Compress left lane	5.55	5.14	73.56	8.41