Metal Ridges Ahead

Indoor speedways conquered. Morning air called from across the wooden floorboards. Straight run toward the balcony! Vrrr-click! In front of me lay a ribbed canyon: the grooved aluminum rail of the sliding glass door. Silent obstacle? Never. Full throttle! Wham! My bumper slammed straight into the first silver ridge. Clack-clack-shhh! Front wheels popped up, caught the metallic trench, and rattled violently across the parallel grooves. Shudder traveled right into my chassis. Balcony reached!