sand is sprinkled over icy asphalt, snow-covered concrete tiles for people to resist slipping.

sand sprinkled icy asphalt snowcovered concrete tiles people resist slipping city parking front multistorey building snow removal staircase facing house entrance safety fracture risky road winter salt weather street dirt sidewalk cold slippery frost danger pathway way dirty footpath frozen pavement tile reagent urban melt service slip freeze mixture grit performed construction chloride car metal fence injury cleaning outdoor careful mud