Algodoo

Do you think you can be able to script my signals?

Yes, wait. I will explain you.

Here is the "color=" part of the script menu of the yellow light:
{((sim.time % 12 > 4 && sim.time % 12 < 6) || (sim.time % 12 > 10 && sim.time % 12 < 12)) ? [1, 1, 0, 1] : [1, 1, 0, 0.2]}

Everything has to be put into {} to be stored as a continous script.

sim.time - a timer that counts how long the scene has been running

(sim.time % 12 > 4 && sim.time % 12 < 6) means: in a period of 12 seconds (0-12, 12-24, 24-36...) more than 4 and less than 6 seconds (4-6, 28-30, 40-42...)

&& = AND

|| = OR

? = IF-THEN

: = ELSE

[1,1,0,1] = [red=1, green=1, blue=0, opacity=1] = yellow
[1,1,0,0] = [red=1, green=1, blue=0, opacity=0.2] = transparent yellow
If you use lasers, for better performance, set the turned off light opacity to 0.

Everything in words:
If in periods of 12 seconds the time is (more than 4 and less then 6) or (more than 10 and less then 12), the color should be yellow, else transparent (no light)

Basis:
{ ( (A) || (D) ) ? [c1] : [c2] } = if A or D are true, the color will be [c1], if not true (else), the color will be [c2]

If it should light once per period, the basis would be:
{ (A) ? [c1] : [c2] }