C-DOT says it's ready to start three proven programs to keep I-70 open through the mountains this winter. Spokeswoman Stacy Stegman says the Heavy Tow program puts wreckers on standby to tow disabled semis blocking the interstate. Then there's the Chain Assistance Program allowing drivers to buy chain and chain-up services between Dotsero and Denver West Blvd. The third program is the Courtesy Patrol, which provides free roadside assistance for flate tires, fuel, jump starts and short distance towing.