Slug lines are transportational arrangements where to meet the requirements of an HOV-2 highway, single drivers wishing to use the highway pick up a bystander who's looking to get to the city but doesn't have a car. i think the 2 might split gas, i'm not sure, but it's a psuedo-hitchhiking arrangement of sorts. It exists in Springfield, Virginia and Loundon County, Virginia with regards to commuters to D.C.
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