Sanding is ongoing throughout the winter. When and where we sand depends on the road conditions and the weather.
Purple routes (hills and bridges) are pre-treated before a snow fall event. We use different types of traction control measures depending on the temperature. In temperatures of -15oC or warmer, sand is mixed with salt brine to provide traction control. In -15oC and colder the sand is mixed with Road Guard before being spread on the road surface.
Like plowing, sanding priorities are based on the use and traffic volume on our streets. After frost, freezing rain or snow, we sand purple routes (hills, bridges, overpasses, high hazard locations and hospital accesses) and red routes (arterials) first. Finally, Green and Orange Routes are sanded.