So where is the best place to be when filtering?
lets say duel carriage way two lanes of stationary traffic.
it would seem you have three possibilites.
left lane inside all the traffic, through the centre, or right lane outside all the traffic.
left lane seems to be the safest option traffic only on one side,
but then again you have the problem of pedestrians if in town and could this be construed as an under take, there's also the problem of car doors being opened on you.
centre lane also a dodgy area traffic on both sides i've found you have to very wary of gaps appearing in traffic and drivers scooting across lanes, then there's the problem of mirrors especially from cars towing caravans.
doors opening again, i've had this happen to me, where some bod decides to jump out for a better look, things being thrown out of car windows, fags,coca cola cans etc.
ok right lane then you get the same problems as above plus the added bonus of folks turning right where you have the potential to get stuck in the lane and have to go round some god awful one way system or stay where you are and lose any advantage the filter was supposed to give you in the first place.
The watch words for filtering would seem to be forward observation and care, this seems at first like an obvious thing to say but i've been surprised at some of the things i've seen whilst filtering from bikers and drivers alike.