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(a)   allow traffic to move at high speeds.

International highways are roads that connect one (a)   with another.

India's first railway line started between Mumbai and (a)   .

Rajdhani Express and Shatabadi Express are two (a)   trains in India.

Deccan Queen and the Palace on Wheels are two (a)   trains of India.

(a)   has the largest railway network in the world.

The (a)   railway line is the longest Trans-Continental railway line.

(a)   is the longest undersea tunnel where the train connecting U.K. to France run.

(a)   and boats were the earliest means of water transport.

Roads and rail tracks are (a)   to lay.