Yes, I would definitely get a failsafe!

I am ordering one as we speak from AllAboutFunHobbies.com - http://allaboutfunhobbies.com/accesories.htm

A LHS told my bro that Emergency vehicles like Ambulences communicate verbally over the 27mhz AM band and that if one went by while he was driving his RC truck he could lose it. It's relatively cheap insurance for all of the time/money/efforts put into them.