Traffic signals can be synchronized so that a car starting at one end of a street and traveling at preassigned speeds, can go to the other end without stopping for a red light. The portion of a signal cycle for which this is possible is called a band- with for that direction. Ordinarily the bandwith in each direc- tion is single. Two problems are solved for this casel as given an arbitrary number of signals along a street, a com- mon cycle length, the green and red times for each signal, and specified vehicle speeds in each direction between adjacent signals, synchronize the signals to produce bandwiths that are equal in each direction and as large as possiblea and b) adjust the synchronization to increase one bandwith to some specified, feasible value and maintain the other as large as is then possible. The method of calculation has been program- med for a 20K IBM 1620.
Samenvatting