1. Get the vehicle out of the travel lane while it still rolls
If the engine has died but the car still has momentum, use it. Florida Statute 316.071 is direct about this: when a vehicle becomes disabled on a highway, "the driver shall move the vehicle so as not to obstruct the regular flow of traffic," and if the driver cannot do it alone, they are required to get assistance to the same end. Failing to do so is a nonmoving violation.
In practice that means steering right while you still have rolling speed, aiming for the widest piece of shoulder you can reach, and getting the car as far from the white line as the ground allows. On the Charlotte County stretch of I-75 the shoulder width varies noticeably, so a few hundred feet of coasting can be the difference between a comfortable margin and a door that opens into traffic. If an exit ramp is within reach — Jones Loop, Kings Highway, Toledo Blade — take it. A vehicle on a ramp or a surface street is a far simpler recovery than one on the interstate, and it is a safer place to stand.
2. Turn on the hazard lights immediately
Turn on your hazard lights before you have finished rolling to a stop, not after. They are what tells approaching traffic that the shape on the shoulder is a problem rather than a parked car.
They also change your legal standing. Florida's Move Over Law requires drivers to move over a lane for stopped emergency, service, utility and disabled vehicles, or to slow to 20 mph below the posted limit when moving over is not safe. The Florida Highway Safety and Motor Vehicles department states that the law now covers any vehicle parked on the side of the road with hazard lights flashing, emergency flares or visible emergency signage — a disabled vehicle or one with a flat tire included. On a 70 mph interstate, that protection is worth switching on immediately.
If you carry reflective triangles or flares and can place them safely on the shoulder well behind the car, do it. If placing them means walking in or near a travel lane, skip it.
3. Decide whether to stay in the car or get out behind it
Staying buckled in a car on the shoulder is reasonable when traffic is heavy, when the shoulder is narrow, or when the weather is bad. Keep your seat belt on and face forward so you are braced if anything strikes the vehicle.
Getting out is the better choice when there is a guardrail, a fence line or a grassy embankment you can put between yourself and traffic, and when you can exit through a passenger-side door without stepping into a lane. Move well behind the vehicle rather than standing beside it, since the area directly alongside a disabled car is exactly where a drifting vehicle ends up.
Southwest Florida adds a factor drivers from cooler states underestimate. A car with the engine off stops being shade and starts being an oven very quickly on a July afternoon between Punta Gorda and North Port. Take water with you when you step out, keep children and pets with you rather than in a stationary vehicle, and get into real shade if any exists.