and even on the trucker channel with them running high power its not uncommon to hear traffic reports from miles away. I have to drive down into the center of my city then back out because its still faster than going around the outerbelt which has an ~10 mile radius and when I'm near the center of the city I can hear truck drivers from all around the outerbelt and outside of it. So after you take out channel 9 and 19 and a couple of the highest are usually reserved for SSB communications you still have 35 to choose from. Then if your running one of the newer smaller CB's most are maxon made and have the same tuning IC and can be modified for 120 channels though I beleive you need a ham license to operate the extra channels since they are outside the unlicensed CB band.
I'm going to get a mobile scanner for my truck then I can monitor channel 19 while leaving the CB on 'my' channel, right now I just use the channel 9/19/normal switch.