Hi Marcustandy,
to give you some idea of the range of a repeater. My local repeater is GB3IR situated near Scotch Corner. I am able to contact the repeater from Wetherby to just south of Newcastle and over to the East Coast. Anyone in the range would hear any traffic reports I or anyone else gave. Each repeater as its own coverage but each repeater that is connected via the internet can access other repeaters that are also connected to the internet. Consequently if I were travelling south down to Liecester I would start off on the nearest repeater but once I got south of Wetherby I could then change to the Wakefield repeater frequency. From the Wakefield repeater I could then connect back to my first repeater, if I wanted to give traffic reports to people on that repeater or I could connect to the next repeater down south, which would be Nottingham. Once connected to Nottingham repeater I could put out a call asking for traffic info. With the Ham repeater system you can get to know of problems way ahead therefore have more chance of avoiding problems. Until recently there were very few truckers on the Ham Bands but due to the relaxing of license regulations more and more truckers are finding it a better way of communication either for traffic reports or a ragchew. One net I was on had a trucker in Nottingham area, a motorist in Durham, a homebase in Bishop Auckland and a regular guy in Minisota USA. I myself was on the North York moors. Not once did any muppets come on to spoil the chat and boy, did the journey fly by. On CB if you are on nights it is difficult to get a contact but on Ham radio it is possible to talk to anywhere in the world and there is always someone out there willing to pass the time of day/night.
Regards
Westie