You are only meant to filter if the traffic is doing less then or equal to 15mph, and you are only allowed to filter 15mph faster then the traffic. Whilst still observing the speed limit.
This means you are only meant to pass stationary traffic at 15mph. Maximum filtering speed is meant to be 30mph in a situation where the traffic is doing 15mph.
If the traffic is doing more then 15mph you are not meant to filter past. Which I think is bizare as if the traffic is doing 15 your allowed to go past at 30, yet if the traffic is doing 16 you have to wait.
Although I don't think its illegal to disregard this I think if you don't stick to it a copper can do you for dangerous driving.
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