Answer:
I cause involuntary movements in your vehicle
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
What is harder to catch the faster you run?
Take away my first letter take away my second letter take away all my letters and I would remain the same.
What has many keys but can't open a single lock?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.