Assuming China wants to have a high speed train to London: Could they tunnel under France and the Channel without other countries getting?

The use of shoulders as travel lanes varies in practice, including use by buses only, use as an HOV lane, use for all vehicles, and use as an ETL/HOT lane. Lane use signals indicate lanes where you can and cannot drive during different hours of the day. In the context of traffic control, a lane is part of a roadway (carriageway) that is designated to be used by a single line of vehicles, to control and guide drivers and reduce traffic conflicts. Reversible lanes are defined as "one or more lanes designated for movement one-way during part of the day and in the opposite direction during another part of the day." The principle is to make use of "unused capacity" in one direction to carry traffic in the other direction. Steve Travia, Bureau Chief of Traffic of Illinois Department of Transportation, talks about switching the reversible lanes on the Kennedy Expressway. Reversing lanes reduces congestion for handling special event traffic, during morning and evening commutes when an incident block s a lane, or when construction or maintenance 11.0 Individual Movement Treatments ... 11-29 Summary of issues for reversible lanes ... Signalized Intersections: Informational Guide 11-2 11-30 Example use of variable lane use sign to add a third left-turn lane during certain times . Yellow X or Yellow Diagonal Downward Arrow: These signals mean that you should move out of the lane as soon as safely

directing traffic at the intersection, or if portable stop signs are in use. Red X: Never drive in a lane marked with a red X signal. On Massachusetts State Route 3 and I-93 and I-95 in the Boston area, all vehicles are permitted on shoulders during peak periods only. You are driving on a road with reversible lanes that are marked with overhead lane signals; choose an answer: a. you may drive in a lane under a green arrow.

Reversible traffic lanes add peak-direction capacity to a two-way road and decrease congestion by borrowing available lane capacity from the other (off-peak) direction. b. you must drive in a lane under a green arrow only when you are passing slower traffic.

(A)rush hour (B) low traffic (C) emergencies (D) weekends only.

c. you must never drive in a lane under a green arrow.

Most public roads have at least two lanes, one for traffic in each direction, separated by lane markings.On multilane roadways and busier two-lane roads, lanes are designated with road surface markings.