Thanks, Mark. All good points to ponder.
The main reason the driver doesn't see it coming is that it's at night, on an unlit road and by the time he sees it in his headlights, it's too late. Of course, that also means he's not going all that fast in the dark. The weather conditions are dry, it's in the middle of the desert. So the road surface is dry, with a bit of sand.
The car is a Jeep - but I mean as in the civilian consumer versions, not an actual military Jeep.
I'm kind of wavering on if it's an improvised stinger, or a police one. The bad guys have got pals in the police and if they've got hold of Tasers they could get hold of a stinger. So I'm still wavering a bit on that.
The bad guys know who they are dealing with here, so they're not messing about. (There's two guys in the car, both soldiers. Though one's behind a desk more these days he's still fit and pretty sharp.) That's why the bad gus have got tasers as well as guns, so they can incapacitate them from a distance. And they've brought plenty of guys along. And handcuffs and shackles. And sedatives. They're not taking chances! It's one I'm still trying to get the details right on, as these guys should definitely not be easy to take down.
Good, good... also good... ok.
Jeeps sit up high and tend to have thick tires (I'm American, please bear with me, I'm perfectly aware the English were the first to develop the language and I'm the one with the accent). But they also have roll-over bars for a good reason.
My aunt was trying to drive up an on-ramp to a bridge on a highway when she accidentally bumped a curb on one side and rolled off the ramp. Luckily, she wasn't going nearly fast or high enough to roll directly into on-coming highway traffic and didn't do any full rolls (just shifted to the side. Everything was fine, even the jeep).
Jeep would also mean it's going to be all-wheel drive. All the tires are going to pushing that vehicle forward. Since you mentioned a desert (a bit of sand on a dry road) and from what I've seen in videos, it's probably going to roll forward for a bit.
He's going to hit that WTF? moment. The bad guys could easily position themselves in front and beside the area the stinger is placed and close in quickly because he's not going fast (far) for very long.
In all likelihood, the vehicle will coast forward after the blowouts. Tires will quickly de-pressurize, feel a slight bump, and from what I remember when we got a flat tire, hear a rumbling sound, the driver will try to apply brakes to come to a stop (and he will very quickly). Probably be able to ease off to the side of the road. I doubt very seriously it will flip or do anything very dramatic. So if you included that I would suggest removing it as that's really Hollywood-like.
I would also suggest having them not know about the ambush at all until the flat tires. The characters open their doors to try to figure out what happened and BAM! multiple footsteps are rushing at them.