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Yes, as said above, it’s the safer place to be.
That said, whenever I’m filtering on the rhs of stationary traffic I ride at a speed to react to anything unexpected. A person stepping out from between cars to cross the road without looking, a car door opening, a car not indicating to make a right turn/sudden u turn etc
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within speed limit.
The speed limit doesn’t apply to bicycles - but that said you should ride at an appropriate speed after doing risk assessment on the road ahead. Filtering alongside stationary traffic and going at the speed limit is almost definitely not going to be safe. You don’t give yourself time to react as described above.
It’s fine to filter on the RHS, actually advisable over filtering on the LHS most of the time, as you are more visible to drivers. Why do you think motorbikes almost always filter on the right? It’s safer.
Hard to apportion ‘blame’ without more info. Could just be bad luck
Ie was your friend going quickly or quite slow / cautious?