Model the Highway Traffic (?) Two-lane Rules
gap1(i) is forward gap on the other lane, gap1,b(i) is the backward gap on the other lane, ? is look ahead on current lane, ?1 is look ahead on the other lane, ?1,b is look back on the other lane
In addition to the one-lane rules, the conditions for changing lane:
- gap(i) < ?
- gap1(i) > ?1
- gap1,b(i) > ?1,b
- random() < Pchange