Tasha Gresham-James steers her black Nissan Rogue through Dundalk’s rush-hour traffic. Even with the windows closed, the pungent odor of diesel fuel is hard to miss, as are the single-family houses that sit cheek by jowl with truck parking lots, bars, manufacturing and transit facilities — even a driver training school.

On and on, through main roads like Holabird and Dundalk avenues, and alleyways not much wider than driveways, trucks lumber through residential neighborhoods.