Originally Posted by
CB HI
My guess:
The cyclist is heading up hill, so it is NOT likely she caught the truck and was trying to pass it.
Likely the cyclist stopped or slowly rolled the stop sign before the truck got there. The truck driver may have seen the cyclist as he approached, but seeing her start her turn, he assumed she would be out of his was as he reached the stop sign WHILE LOOKING LEFT for his chance to make the turn. Seeing he had a clear way from left traffic, he made his turn without ever trying to check where the cyclist was during his turn.
this seems to be a credible guess. I'm not sure about the traffic culture there, but around here there is some likelihood a driver would have rolled that stop sign at speed if there was no traffic to the left