The F word...

[Arch]

Just to clarify: when you're talking about 'filtering' here, you mean alongside stationary (waiting) cars... but down the left (undertaking, but possibly within a cycle lane) or right (overtaking, near the middle of the road)? Or can 'filtering' mean either?

To me, filtering can be either, and I'd tend always to clarify 'I was filtering' with 'on the right', or 'on the left'...

I rarely do it on the right - if there isn't room to do it safely on the left (IE to ride slowly down the left, watching for potential doorings, and never down the inside of something long), I more often wait in line. Mostly because my need to filter is almost always due to traffic lights, and they'll early always be about to change within a minute.