HBO has decided not to air a new Lily Tomlin comedy series, even though six episodes are in the can. 12 Miles of Bad Road, created by Designing Women writer Linda Bloodworth-Thomason, is a one-hour comedy about the Shakespeare family, a millionaire Texas clan whose real estate fortune is mixed up with their eccentric antics. Sounds vaguely like Dallas meets Arrested Development, but whatever the recipe, HBO has given it the thumbs down.