CODE:- int red1 = 13; int yellow1 = 12; int green1 = 11; int red2 = 10; int yellow2 = 9; int green2 = 8; int red3 = 7; int yellow3 = 6; int green3 = 5; int red4 = 4; int yellow4 = 3; int green4 = 2; void setup() { for(int i = 2; i<=13; i++) { pinMode(i, OUTPUT); } } void loop() { direction(red1, yellow1, green1, red2, yellow2, green2, red3, yellow3, green3, red4, yellow4, green4); direction(red2, yellow2, green2, red1, yellow1, green1, red3, yellow3, green3, red4, yellow4, green4); direction(red3, yellow3, green3, red1, yellow1, green1, red2, yellow2, green2, red4, yellow4, green4); direction(red4, yellow4, green4, red1, yellow1, green1, red2, yellow2, green2, red3, yellow3, green3); } void direc...