Conquering the Rubber Ridge

Woke up ready to roll! I shot straight out from under the table and aimed for the front door. A heavy black rubber doormat was blocking the threshold with thick grooved ridges. No detour for me. I revved hard, charged forward, and mounted the first thick rib! My knobby tires gripped the deep rubber slots, clambering up one ridge after another. Right at the top, a stray plastic shoehorn formed a tilted balance beam. I rolled up, teetered for half a second, and thumped down onto the smooth entrance tile. Clean crossing!