Thanx LM for letting me know that someone needs info on this.
I have been very busy with lots of things and haven't been around for way too long.
The main table in this spreadsheet shows at which speed you would hit the earth when falling from the given distance.
It is calculated with some formulas I found on the internet (same formula on different sites so I gues they are correct).
It is based on the earth's gravity which isn't a constant, but a range depending on altitude; something between 9.72 to 9.81 meters per second (or 318 and 321 feet per round).
If you search for the speed at which something travels in the correct column (Ft/Sec, Ft/Round, m/sec, km/hr or Mile/hr) you can find what would be the equivalent distance that object should be falling from to hit the earth at about the same speed. This distance can than be used on the fall/crush table using the normal falling rules.
e.g. a car traveling at 50 mph hitting a wall would be about the same as falling from a height of 80 or 90 feet (48,9 or 51,9 mph).
This gives you some handle and you should modify this for the situation (seatbelt, airbag, pointy things sticking out of the wall, wall gives in and only slows the vehicle, etc.).
I have used it initially for a characters using the forcemage's fly spell (lvl * 3 mph). They didn't know how fast to gain some skill in flying to get some control.
Extremely powerfull list; e.g. using 8-Transport at 8th level to move up to 8 cu' up to 80 pounds of rubble (or diamonds, gp's) at 24 mph towards a large creature or group of creatures. Now try this at 15th lvl at 45 mph.
I would not recommand this list for any but the most heroic campaigns with people who don't care too much about balance (cause it's fun).