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On mine with RTTI, you get a lot more lines ie two lines per road generally (for most main roads and a lot of minor roads too). The lines are green, yellow amber or red. All works well on mine so long as you remember to reverse the side of the road they are on. So, going into central London at 8am in steaming traffic, the right side will be red and the left green while you sit in the traffic with not a single car on the other side of the road!
To be perfectly honest, I think you are probably better using the triangles/warnings for major incidents. For me though I have the choice of driving north of the Thames home, or South, so the traffic flow maps are quite useful.
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