Traffic reporters rely largely upon information supplied to them by the Highways Agency, police forces and transport operators (such as rail and ferry companies). That information is supplemented by further information from listeners. If they aren't told about a problem, they can't report it!
If you keep encountering problems, Gordyagusta, I hope that you always stop and phone in the information. If you don't do so, how can you complain about others? (I've got the traffic numbers for Radio 2 and four BBC local radio stations stored on my mobile phone. Can you say the same?).
Chris