SHABBAT

If the light is needed for travelling, it may be turned on. If it is possible to arrange before Shabbat that it should become turned on automatically when the vehicle is turned on, that is preferable. That goes for air-conditioning as well. If the air-conditioning does not turn on automatically, then the driver should open the windows, but if the windows can only be opened by the use of electricity, then there is no difference between the windows and the air-conditioning. If there is a concern that not using the light or air-conditioning will affect the purpose of the journey which is to avoid danger, then they may be turned on. If, of course, there is a need to transport someone who is not well, there are different laws involved and each case must be judged individually. In any event, it is always preferable that a non-Jew perform actions which are normally forbidden for a Jewish person on Shabbat.