Been contemplating on getting a road bike for some time now, but too scared of cars. I have a few friends who are road bikers, but stay on trails and can get in a good 60-80 miles. Not sure how much truth to that, but got me more interested. Anyway, just got my wife a starter road bike and I might pull the trigger on one some time in the near future. Can someone help explain to me what the difference between a regular road bike, a time trial bike and a triathlon bike? Seems like the TT and Tri bikes are way cheaper for some reason. Also, how's Campagnolo compared to SRAM and Shimano? Thanks!!!