Fredericton Drivers

This will not be my last post on the general inadequacies of many Fredericton drivers.  For the third time in as many days someone has simply stopped in the middle of the road in front of me.  It's like they just lost track of where they were and had been planning to go.  What do you do?  You don't want to overtake as most local drivers don't indicate anyway and the car in front may simply be making a traditional Fredericton gradual right or left turn.  You don't want to startle them (wake them) by sounding the horn.  It's a mystery.  Any advice would be welcome.