MickieSure- I believe the OP is on insulin, so he might have a road ahead adjusting meds with low carb.

RythmBeat- if you are on insulin and your plan for hypos is to find a gas station, i am frankly shocked and glad I drive more than 3000 miles away from you. You NEED a source of sugar in the car- i use glucose tabs, as they work the quickest and are easy to measure- each one is 4 carbs. plus they are shelf stable for life and don't taste good, so you won't overeat them.
other good options are dried fruit or small (4oz) juice boxes.
Also if you are that low, you need to pull over. This is no joking matter.
a blood sugar of 55 has been shown to give a person the reaction speed as a woman who has had 3 alcoholic beverages within one HOUR. I know for me, I don't feel symptoms until far lower than 55 (usually low 40's). Please be safe!!!!