Cities: Skylines update adds tunnels and more for free but will

Fewer drivers in Seattle's Highway 99 tunnel could create need for bailout

8 Ways to Reduce Traffic in Cities: Skylines - KeenGamer

Rolling in the deep: Sound Transit's downtown Seattle tunnel would bring riders 145 feet below the street

Sumner Tunnel closure traffic impacts, detours, free train rides – NBC Boston

Cities: Skylines patch brings European style buildings

Cities: Skylines

Cities: Skylines patch adds tunnels

Cities: Skylines II Feature Highlight #3: Public & Cargo Transportation - Paradox Interactive

Blessed or Cursed? I built underground tunnels for pedestrians and banned crosswalks. : r/CitiesSkylines

Widening Highways Doesn't Fix Traffic. So Why Do We Keep Doing It? - The New York Times