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On September 3, 1967, Swedish drivers switched from driving on the left-hand side of the road to driving on the right-hand side of the road, a day known as Dagen H.
 
Most nations have right-hand traffic (RHT) regulations, meaning the flow of traffic is on the right-hand side of the road. Left lanes are used for passing. The United Kingdom and many members of the Commonwealth of Nations (including India, Pakistan, and Australia) have left-hand traffic (LHT) regulations.
 
Most nations with right-hand traffic regulations manufacture and import vehicles where the driver sits on the left-hand side. This is a safety feature, allowing the driver to see past vehicles in front of his or her own car. In nations with left-hand traffic regulations, most vehicles feature drivers on the right-hand side.
 
Sweden’s drivers adjusted beautifully to Dagen H, which required massive changes in infrastructure as well as a huge public relations (PR) campaign. In fact, traffic accidents actually decreased after the switch.
adjust
Verb

to change or modify something to fit with something else.

campaign
Noun

activities designed to achieve a social, political, or military goal.

Commonwealth of Nations
Noun
association of independent nations and dependent territories linked by historic and cultural ties, as parts of the former British Empire, and cooperating on matters of mutual concern, especially regarding economics and trade.
construct
Verb

to build or erect.

engineer
Noun

person who plans the building of things, such as structures (construction engineer) or substances (chemical engineer).

import
Verb

to bring in a good or service from another area for trade.

infrastructure
Noun

structures and facilities necessary for the functioning of a society, such as roads.

manufacture
Verb

to make or produce a good, usually for sale.

massive
Adjective

very large or heavy.

Noun

political unit made of people who share a common territory.

public relations (PR)
Noun

the art, science, and business of promoting an organization, person, or event.

regulation
Noun

rule or law.

traffic
Noun

movement of many things, often vehicles, in a specific area.

vehicle
Noun

device used for transportation.

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