Left- and right-hand traffic
Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in bidirectional traffic, of keeping to the left side or to the right side of the road, respectively. They are fundamental to traffic flow, and are sometimes referred to as the rule of the road.
In LHT traffic keeps left, and cars usually have the steering wheel on the right (RHD – right hand drive), putting the driver on the side closer to the centre of the road. Roundabouts circulate clockwise. RHT is the opposite of this: traffic keeps right, the driver usually sits on the left side of the car (LHD), and roundabouts circulate anticlockwise.
In most countries rail traffic follows the handedness of the roads, though this is not always the case. Boat traffic on rivers is effectively RHT. Boats are traditionally piloted from the starboard side to facilitate priority to the right.
Worldwide Distribution by Country
| Country | Road traffic | Date of switch | Notes, exceptions | |
|---|---|---|---|---|
 Abersiania
|
LHT | |||
 Adentia
|
LHT | 1984 | Some regions still use there old RHT system | |
 Ajakanistan
|
RHT | |||
 Akvarelusus
|
LHT | |||
 Araucarlia
|
RHT | |||
 Avengis
|
LHT | |||
 Baltanla
|
LHT | |||
 Byasa
|
LHT | |||
 Creeperopolis
|
RHT | Some roads in Creeperopolis are only one lane-wide, such as the Yungas Road, and require cooperation and maneuvers from both directions of traffic to drive smoothly and safely. | ||
 Eleutherios
|
RHT | |||
 Daesdain
|
LHT | |||
 Enjola
|
RHT | |||
 Entropan
|
LHT | |||
 Gjorka
|
RHT | |||
 Groffenord
|
LHT | |||
 Girisko
|
LHT | |||
 Hapatmitas
|
LHT | |||
 Jackson
|
RHT | |||
 Karimun
|
LHT | |||
 Kernev
|
LHT | |||
 Kersevonia
|
RHT | |||
 Kivu
|
RHT | |||
 Kwazulu-Ciskei
|
RHT | |||
 Lurjize
|
LHT | |||
 Majocco
|
RHT | |||
 Monsilva
|
LHT | |||
 Montesayette
|
RHT | |||
 New Illyricum
|
RHT | |||
 Paleocacher
|
RHT | |||
 Pavulturilor
|
RHT | |||
 Quebecshire
|
RHT | |||
 Rakeo
|
RHT | |||
 Rakhman
|
RHT | |||
 Rawa Principality
|
RHT | |||
 Reykanes
|
LHT | 1987 | ||
 Salisford
|
RHT | |||
 Saratov
|
RHT | |||
 Sconia
|
RHT | |||
 Sequoyah
|
NO DATA | |||
 Storosnova
|
RHT | |||
 Svedonia
|
RHT | |||
 Syntsi
|
RHT | |||
 Terranihil
|
RHT | |||
 Tirol
|
LHT | 1924 | In some rural areas with distinct road systems RHT is used. | |
 Tranquillia
|
LHT | |||
 Tumland
|
LHT | |||
 Uulgadzar
|
RHT | |||
 Unicania
|
RHT | |||
 Zloveshchiy
|
RHT |
