To prevent carts from tipping over, please them curbside, two feet apart, to allow clearance for the mechanical arm of the truck. Plus, do not overfill the cart. Be sure the lid is closed to prevent trash from spilling out when lifted by the truck.
Fall is a good time to wash out your carts, before putting your hose away for the winter. All year long, it's a good practice to 'bag' the trash and tie the bag shut, before taking the cart curbside. This prevents a nasty trash-spill along your street!