NORTH FORSYTH — Effects from the start of the 2015-16 school year in Forsyth County were evident Thursday in the form of traffic gridlock. Between 6 and 10 a.m., as school buses and nearly 50,000 employees and students returned to their campuses, Forsyth County emergency personnel handled 16 wrecks, according to Robin Regan, a spokesman for the sheriff’s office. Just one resulted in injuries — the severity or number was not immediately clear — and at least two caused “significant traffic delays.”