Unfortunately, it seems that they fail to plan for this also. It's no secret that many would like to see Slug Lines go away. Some believe that doing away will will increase ridership on busses and trains. This is a false hope. Although ridership will go up - the number of cars added to the highways will be tremendous.
Folks slug because they like the comfort and flexibility of cars.
Many will just drive to work. A recent snow storm caused the HOV restrictions to be lifted. The bus system was overwhelmed with riders. Not from carpools or vanpools but from the Slug system. Drivers in the slow lanes - Let's face it, there are many folks that can't use the HOV lanes.