It would also reduce street traffic by providing an underground route for trucks and buses to the trade center site.

And with underground routes, they say, the system will move people faster than a line built at street level.

They afforded an invisible underground route to the building's interior.

The girl, who knew this underground route, was not afraid to walk in utter blackness.

An underground route would allow "direct long distance traffic to and through the city centre".

This would take two years and could not begin until a new underground route is approved, Verizon said.

It is said that there was an underground route joining them.

There is an underground touristic route in the mine, opened for visitors.

Nor do its "directions" conform to any known underground route.

His fingers explored the curved wall of the underground route.