The sequence of signal lights is red light, yellow light, green light and yellow light, and they light up every 30 seconds. In this way, each cycle takes 2 minutes. After 30 minutes from 8: 00 to 8: 30, 30 divided by 2 equals 15, that is to say, at 8: 30, the signal light * * * is red, yellow and green.

45 divided by 2 is equal to more than 22 1, that is to say, the signal light * * lights up 22 times in the order of red light, yellow light, green light and yellow light, and then lights up 1 time. So the number of times each lamp lights up is as follows:

Red: 22 × 1+ 1 = 23 (times)

Huang: 22×1+22×1+1= 45 (times)

Green: 22× 1=22 (times)