Jesus Brace

n. Colloquial, Possibly Australian

See also oh shit bar

Found in automobiles, but appear to serve no purpose other than
a) assisting corpulent persons and/or people to alight the vehicle
b) grabbing on to in times of a potential accident to brace oneself, i.e driver exceeding the speed limit

So called for one of two reasons
i) person grabbing the 'brace' praying to their respective deity to avoid the accident, being an english term this is most likely to be a christian, hence use of 'Jesus'
ii) person audibly exclaiming 'Jesus!'in the same situation as above

In absence of a bar, may also be referred to as a 'Jesus Strap'

Jim clutched the Jesus Brace as his brother went drifting through the mountains Initial D style