Man I ride SS everywhere because of my toe overlap (no one talks about this before you get into fixies!!) but it's super important to me that I keep my muscles 'supple' like fixie riders so I pedal all the time even when I don't need to, for example like when the road goes downhill slightly, or backwards when I'm stopped at traffic lights.
Which is to say the only dependable indicator of whether or not someone is slowing down is their distance relative to you from one moment to the next. Other behaviour can be an indicator but is hardly dependable. Other instances when this theory doesn't work: going downhill, ignoring signage and just coasting through the obstacle, the pro-tour peleton (they hardly pedal at all)
You and your toe repped!
Riding fixed is like putting a fresh sheet on your bed after you've made it.
Isn't it ironic? Don't you think? It's like ra-ee-ain on ya wedding day...