Top Gear did just that:
https://www.youtube.com/watch?v=9iKGfo1wmOM
I think I'd prefer if Mythbusters, or somebody else for that matter, did it with a proper crash test dummy. For example, apparently the Smart Car was the only one to still
pass the offset barrier even when they weighted it up to a mid-sized car.
For example, I'm seeing figures for > 100 g and 214g for survival in crashes. > 25 G for 'death or serious injury likely', but 46.2g for rocket sled deceleration tests which didn't have fancy pre-tensioning seatbelts with careful amounts of slack. Of course you also subtract points for not having a 5 point harness, but add points for airbags.
Still, let's do some figuring:
70 mph = 31.3 m/s, 1 G = 9.81 m/s^2
I'm not seeing the crush depth of the smart, other than it's 'not a lot', so I'm looking for crush depth necessary.
25G(death or serious injury NOT likely): 2M necessary.
100G(survivable): .5M(Almost there?)
214G,
Kenny Bräck: .23M(Which is in range of what the Smart has).
Honestly, I wonder how many G's we should move the figures up once you start adding smart airbags and everything.
On a different topic, an extremely safe car is the Tesla Model S - which to date doesn't have a fatality or even serious injury, even in one case where the car hit concrete in excess of 100 mph, took out a bunch of concrete barrier, went through another concrete barrier, before finally hitting a tree. Driver got out of the vehicle without serious injury. But then the Tesla has both a huge crush zone(no engine in front to worry about), and crazy strong passenger compartment. Still, given it's mass and strength it's strategy seems more like 'plow through the object'. I get the feeling the concrete dividers in the video would not have stopped a Tesla.
Not to the pickup truck drivers - From what I've read of the tests I wouldn't be surprised that in a head on collision the thing is likely to act like a ramp and toss your truck into the air. It weighs more than the F-150!