(Sigh) Chop the tree up, put the branches under wheels. Drive yourself out.

If that is not practiable, green branches make a dinkum signal fire.

To do that: pile up branches, take your T-shirt off. dip in petrol tank and place under branches. Light. If you don't have a match or lighter, use the battery and your jump leads supply a spark.

Only problem you now face is that the smoke is white against a white background.

So put the spare tire on the fire. That should give you a nice big cloud of black smoke.