Impacts of Snowy Weather Conditions on Expressway Traffic Flow Characteristics

Table 2

Traffic flow characteristics of expressway under various weather conditions.

Time period	Morning peak		Evening peak		Off-peak
Weather condition	Heavy snow	Normal weather	Heavy snow	Normal weather	Heavy snow	Normal weather
Average speed (km/h)	56.60	54.96	59.84	46.05	64.36	71.71
Volume per hour (veh./h)	1632	4722	1378	4952	832	2751
Speed change on heavy snowy day (%)	+2.98		+29.95		−10.26
Volume reduction (%)	65.44		72.17		69.76