Hello, A little Advice If You Will :)

Not too sure what a "slug line" is, but this is how I've been taught to set scenes:

Assuming this is the homing in shot: SCENE # - EXTERIOR. HIGHWAY. NIGHT/DAY TIME.

SCENE # - INTERIOR CAR ONE

SCENE # - INTERIOR CAR TWO

SCENE # - INTERIOR CAR ONE

SCENE # - INTERIOR CAR TWO

AND IT WOULD BE SCENE # - EXTERIOR. HIGHWAY. whenever action moves from either car to outside.

Qwerty, a slug line is the scene description line. INT., EXT., etc.

Bradn, you're probably over-thinking it. The slug line tells you where the camera is. Do you open with a shot inside the car? Then the slug line is INT. CAR - DAY/NIGHT. Do you open with an establishing shot? Then it will be an EXT.

The important part is that when the shot changes (inside the car to a shot of the car flying down the freeway), you change the slug line. Fast action sequences can have numerous scenes/slug lines that change quickly. Just don't try to use one slug line for the whole thing.

The best way to handle this is probably like so...and keep in mind this is just off the top of my head so you can fill in the action how you like.

EXT. HIGHWAY - DAY/NIGHT (whatever yours is)

Two cars zoom down the highway, guns blazing and bullets flying.

INT. JON'S CAR - DAY/NIGHT

Jon looks at Suzie through the rearview mirror before firing off another round.

INT. SUZIE'S CAR - DAY/NIGHT

Suzie leans to the side as the bullet hits the windshield of her car.

INTERCUT - JON'S CAR/SUZIE'S CAR

Jon shifts angrily and slams the gas pedal.

Suzie matches him tit for tat.


Or whatever action you've got going on there. If there's going to be a lot of back and forth it's best to use an intercut and save yourself the sluglines. I would recommend starting with the set-up shot on the highway so we see there's a chase. Then move to car # 1 and give us a brief description, then car # 2 brief description, and then the intercut. Each time you change cars, start a new line.

Hope that helps.

I believe there is another way to handle this. Especially when the scene is cross-cutting quickly from one car to another.

That is:

EXT. COUNTRY HIGHWAY - DAY

TWO CARS chase each other down the two lane black top.

INTERCUT:

INT. JOHN'S CAR /LAURA'S CAR - DAY

John levels his gun AT--

LAURA'S CAR--

She looks in her rear view mirror. SEES--

JOHN

pulls the trigger.

SMASH!! The bullet punches a hole through the back window and shatters Laura's windshield.

I would also suggest reading the car chases scenes from several scripts you're familiar with.

Here you can find several websites with movie scripts:

http://www.absolutewrite.com/forums/showthread.php?t=24087

There's plenty of movies with car chases and literally hundreds of scripts can be found through those screenplay databases. As far as the exact way to write it, I'm not that good yet to give an example but I think the INTERCUT that ricetalks mentions would work and Kristy's example also.