某交通管理部门要求，交通灯要求主干道绿灯至少保持2分钟（其中不包括绿灯闪烁时间），在此前提下，当支路检测到有车或人时，主干道绿灯闪烁3秒，然后黄灯持续亮3秒，红灯再亮，同时支路绿灯亮，红灯灭。当支路连续5秒检测不到车和人时，支路绿灯闪烁3秒，然后黄灯持续亮3秒，红灯再亮，同时主干道绿灯亮，红灯灭，支路绿灯最长持续20秒（不包括绿灯闪烁时间）。若从绿灯闪烁开始禁止支路上行人和车辆通行，则可保证主干道禁止通行的最长时间为26秒。支路可通过仪器来检测有无车辆和行人，对于行人，由于其不定性，需要设置一些仪器，如果有行人想通过，需站在其中一个检测仪下，当任一仪器检测到有车辆和行人要横穿主干道时，发出信号。由于主干道禁止通行的时间至多为26秒，因此，无需检测有无车辆和行人。-

Requirements of a traffic management department, asked the main road traffic lights green for at least 2 minutes (not including the green light flashes the time), in this context, when the slip road vehicle or person is detected, the main road the green light flashes for 3 seconds, then yellow lamp is lit for 3 seconds, then red light, green light at the same time slip, red light off. When the slip is not detected continuously for 5 seconds when the cars and people, slip the green light flashes for 3 seconds, and then the yellow light is lit for 3 seconds, then red light, green light while the main road, the red light off, the longest continuous green slip 20 seconds (not including the green flashing light). If the green light flashes from a ban on pedestrian and vehicle traffic support on the road, you can ensure that the maximum time the main road closed to traffic for 26 seconds. Slip through the instrument to detect whether the vehicles and pedestrians, the pedestrians, because o