http://imdb.com/title/tt0073600/

Race with the Devil (1975)
6.6/10 from 4470 users Updated : 2017-09-22
Rating: 5.2/10
[fresh!] 57% [audience liked it!] 55%
Action , Horror , Thriller
Peter Fonda , Warren Oates , Loretta Swit , Lara Parker , R.G. Armstrong , Clay Tanner , Carol Blodgett , Phil Hoover , Ricci Ware ,
Paul A. Partain , James N. Harrell , Karen Miller , Arkey Blue , Jack Starrett , Wes Bishop
Jack Starrett
IMDB 88
1975
Frank and Roger and their wives take off for Colorado in a recreational vehicle| looking forward to some skiing and dirt biking. While camping en route| they witness
a Satanic ritual sacrifice| but the local sheriff finds no evidence to support their claims and urges them to continue on their vacation. On the way| however| they
find themselves repeatedly attacked by cult members| and they take measures to defend themselves.