Table 1: Decision variables of link grade and its corresponding information in China.

Link status variable 0123456789

Link gradeNo-way4th-level3rd-level2nd-level2nd-level1st-level1st-levelHighwayHighwayHighway
Lane0222446468
Design speed0406080100100100120120120
Capacity015003000400060001500020000300004500060000
Construction cost
(tens of thousands of Yuan/km)
08020050080015003000400060007000