“Roadkill” is a leaden, lumbering C-movie about serial killings on the backroads of Florida back in the ’80s.

For his second feature, writer, director and co-star Warren Fast (“Finding Grace”) reaches back for a “drive in” era motors-and-murders thriller about a “Highway Hunter” terrorizing the good folks along the stretch of the state nicknamed “Florabama” with good reason.

It’s got a bombshell who wears midriff-baring shirts, tight jeans (suitable for “Daisy Duke” cutcoffs) and sucks a lollipop like a pro, a Jesus-coiffed drifter who hitches a ride with her, vintage cars and vintage gas stations and diners and a good ol’boy sheriff who is no more a “good” old anything than most Florida sheriffs, then and now.

What it doesn’t have is much of a story, interesting characters or an editor who can hide bad acting, crap dialogue, limp plotting and nonsensical twists by “fixing it in post” after the damage has already been done on the set.

Ryan Knudson, still wearing his Southern Protestant Jesus hair and beard from a recent “Revelations” mini-series, plays “The Hitchhiker,” a fellow with a dark past, his nightmares tell us. His Momma (Christina R Gregg) treated him like a dog, and killed his dog so he wouldn’t “have to share your dogfood” or the doghouse she made him sleep him in.

The Hitchhiker is a slow walker and slow talker. But he winds up in the 1969 Chevy Nova of a 1983 Playmate of the Month candidate, The Driver (Caitlin Carmichael of “Midnight in the Switchgrass” and “Wheelman”).

They’re on the road to somewhere. Or nowhere. No names are exchanged, no backstories are explained.

“I get the feeling, no matter what happens, I don’t think I’m gonna get where I’m going with you,” he drawls.

They’re hassled by the sheriff (writer-director Fast) before events circle around to put them both in his custody. Seems this “Highway Hunter,” a dormant serial killer, is back on the clock, killing service station attendants, short order cooks, random folks hither and yon.

One or both of the people in that sadly souped-up Chevy has got to be a suspect.

The violence here is grisly but still lacking in credibility. The chases are sleep-inducing. The effects — the driving scenes are all green-screen projections — primitive.

The prologue, with The Hitchhiker dreaming of the hell growing up was for him, is given a grainy, scratched celluloid film treatment, maybe the stupidest waste of an effect I’ve seen since my days of judging student films.

It’s just a genre picture, so the bar is low. A few decent ideas and a little more skill in making one’s twists and surprises pay off might have given this a chance of working. I mean, they had a mantrap/femme fatale suitable for any drive-in movie pinup poster.

But the whole enterprise just lies there, squished and rotting on the tarmac.

Rating: unrated, graphic violence, drug abuse

Cast: Caitlin Carmichael, Ryan Knudson, Trenton Hudson, Danielle Harris, Christina R. Gregg, Buddy Campbell and Warren Fast

Credits: Scripted and directed by Warren Fast. An Uncork’d release.

Running time: 1:29