Though the smooth and wide highways constructed in big cities seem to be very attractive for the drivers, the ease of use is also the cause of accidents. Cars rushing at extremely high speeds and insecure change of lanes are a common sight on the highways. With the help of novel infrastructure design engineers, we can make the best possible use of highways. If these are designed properly and sign boards are placed at the required points, a number of road accidents can be avoided.

　　The basics of infrastructure design

　　Reason for construction of infrastructure Infrastructure must (1)________ the demands of today’s fast­paced lifestyle.

　　Challenges of design and (2)________ Various rules, standards, safety and usability should be taken into careful consideration.

　　Skilled engineers, scientists and statisticians have to work hard (3)________．Materials must be (4)________ to ensure their qualities.

　　Points to follow Various engineers meet to make sure about fundamental (5)________ of the road.

　　Things like (6)________trees that are potentially dangerous must be done before construction.

　　Safety barriers should be carefully (7)________ before being placed to prevent accidents.

　　Material that can (8)________ light should be used to marks on the pavement.

　　Possible problems and solutions Smooth and wide highways may (9)________accidents.

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