Table 4: Experimental design.

Run Description   See Tables 1 and 2   Time between arrivals Baseline Run1  E or W 15 sec    N or S 10 sec   Min time traffic light green 90 sec   Time between arrivals Run2  E or W 12 sec  N or S 8 sec   Min time traffic light green 60 sec   Time between arrivals Run3  E or W 12 sec  N or S 8 sec   Min time traffic light green 30 sec   Time between arrivals Run4  E or W 10 sec  N or S 6 sec   Min time traffic light green 60 sec   Time between arrivals Run5  E or W 10 sec  N or S 6 sec   Min time traffic light green 30 sec