I still don't understand about 'jumping a red light'.
If the lights ahead are red, am I entitled to turn left if there is nothing ahead or to my right to stop me?
So many Thais do it in Chiang Mai and Lamphun and I do it if it is safe. It helps me and it helps traffic flow.
As far as I know, there is only one set of lights in Chiang Mai that has a warning that cars MUST all stop at the red light. That is at Panthip Plaza. The sign used to be in English and Thai but the English was 'removed' and a new sign put up in Thai only!