I think they are very safe they are a roll cage on wheels doesn't matter what you drive if you get hit by a semi your coming out on the losing end. These cars a so light if you did get hit the energy would be transfered it would be like kicking a soccer ball as to kicking a brick. We sometimes think the bigger vehicles are the safest but sometimes not
Here is a vid of a ext cab truck at 40 MPH compare the driver compartment to the 70 MPH smart car
http://www.progressive.com/video/40F-150.mpg
see how well your vehicle faired
https://onlineservice1.driveinsuranc...ash_videos.asp