With Lila Kirby's (Eve Brent) car on the side of the road where she ran out of gas, she gets in John Prescott's (Tod Andrews) car who offered his help. As Prescott pulls away, Kirby's car is no longer there.
When Prescott and Lila drive away in his car to go get gas for her car, there was a house right there. They could have checked to see if anyone was home and if they could call for help.