Traffic Updates - What Can I Use ?

[theshrew]

Im looking for suggestions please chaps.

What im after is something that will show me if there are any delays etc around me. Normally check before I leave the house or work to come home again but things change quite quickly and I can end up stuck for flippin ages.

Can you buy something to do just that ( im thinking not ) or am I better off going for a Sat Nav with traffic info ? If the latter how well do they work ?