It is the beginning of a paragraph of a short story I wrote which is about travellingtraveling by car in the mountains. What follows after this is a description of the landscape seen off the side roaderoad.
To deviate means to turn aside, to turn away from. To deviate from the road means to leave the road and travel some other route. If that's what you mean, use "leave" or even "veer off", which are much more idiomatic English.