Before you travel from one country to another, you should know their culture, their people, their food, and many more. Especially to those visiting from a right-hand driving country to a left-hand driving (LHD vs RHD) country or vice versa.
1. What are LHT and RHT?
LHD means left-hand drive, and RHD means right-hand drive. While RHT means right-hand traffic, and LHT means left-hand traffic. You can understand it like this: LHD is RHT, and RHD is LHT.
So If a car is Left Hand Drive, the steering wheel is on the left side of the car. And then left-hand-drive cars need to be driven on the right side of the road. Such as China, the United States… While if a car is Right Hand Drive, the steering wheel is on the right side of the car. And then right-hand drive cars need to be driven on the left side of the road. Such as Japan, Thailand, Australia…
2. Why it is LHD?
The history of left walking comes from Greek, Egyptian and Roman times and is more widely used than right walking. From a habit, going left becomes a tradition and then becomes the law. The left-handed rule was well established in Rome by cities with dense traffic. And left walking is a symbol of aristocratic status.
After the French Revolution, the right walking gradually became popular, and it was a symbol of revolution. And other countries conquered by Napoleon have implemented this right-walking system.
When a car was created a hundred and ten years ago, it used a three-wheeled structure without brake and gearshift equipment. The driver’s seat is located in the center of the body.
With the increase in vehicle speed, the brakes and gear shifting devices controlled by hand cannot be installed in the cockpit according to the technology at that time, and they must be arranged on the outside of the car body. Since most people are used to using the right hand, in order to be accurate and safe, the driver can easily control the shift and brake, the designer naturally sets the driver’s seat on the right side of the body. At this time, Europeans and carriages maintained the habit of walking on the right. When the car first came out, most of the owners were wealthy people, and they all hired drivers to drive. In order to facilitate the driver to get off and drive the door for the owner, and to get out of the car at any time to clear obstacles on the road, so as not to stab the pneumatic tires, early cars naturally became “Right drive right” patterns. Due to the increase in car ownership, driving right and driving right affect sight and often causes accidents. Later, the locomotive gradually adopted the left-hand drive.
Henry Ford, the founder of the Ford Motor Company, was the pioneer in changing the driving side. He designed his Model T automobile with the left-hand drive. It enabled the drivers to drive on the road’s right, allowing the passengers to exit onto the pavement. The success of the model T automobile makes this left-hand-drive system spread all over the world.
3. Why it is RHD?
In Japan and the UK, it is still left walking. Because 90% of people are right-handed. When fighting on horseback, people are accustomed to holding weapons in their right hand, and they must move forward on their left.
Because the British believe in tradition, they still maintain the tradition of left-wing. So now only Britain and countries that were once British colonies around the world maintain the tradition of left-wing. But clever Britain invented the central lane divider, which greatly improved the safety of driving.
And for more information about LHD and RHD, you can check this link.
4. Where is LHD and where is RHD?
4.1. Where is RHD.
RHD: UK Territories and British Autonomous Region: Anguilla, British Virgin Islands, Cayman Islands, Falkland Islands, Isle of Man, Montserrat, St. Helena, Turks & Caicos Islands.
Asia: Bangladesh, Bhutan, Brunei, Hong Kong, India, Indonesia, Japan, Macau, Malaysia, Nepal, Pakistan, Singapore, Sri Lanka, Thailand.
Europe: Cyprus, Ireland and Northern Ireland, Malta, Scotland, Wales.
Africa: Botswana, Kenya, Lesotho, Malawi, Mauritius, Mozambique, Namibia, Seychelles, South Africa, Suriname, Swaziland, Tanzania, Tonga, Trinidad & Tobago, Rwanda, Zambia, Zimbabwe.
America: Antigua & Barbuda, Bahamas, Barbados, Bermuda, Dominica, Grenada, Guyana, Jamaica, St Kitts & Nevis, St. Lucia, US Virgin Islands, St. Lucia Vincent & Grenadines.
Oceania: Australia, Fiji, New Zealand, Papua New Guinea, Samoa, Solomon Islands.
4.2. Where is LHD?
Except for the RHD country shown, other countries are all LHD.
In projector lens choice, there also have two types. One is LHD headlight lenses, and one is RHD lenses. You can see its difference in cutting light output.
In Europe, headlamps approved for use on one side of the road must be adaptable to produce adequate illumination with controlled glare for temporarily driving on the other side of the road. And our projector lens produces an asymmetrical light suitable for use on only one side of the road. Low beam headlamps in LHT jurisdictions throw most of their light forward-leftward; those for RHT throw most of their light forward-rightward, thus illuminating obstacles and road signs while minimizing glare for oncoming traffic.
Now you must know what is LHD and RHD. This will help you choose the right projector lens when you retrofit your car headlight. If you still have some projector lenses, please contact us and send an email to me.
5. Straight lines become more and more popular.
Now in these years, straight lines headlight projector lens become more and more popular, especially in the Indonesian headlight wholesale market. With this straight-line cutting, the lighting on road will be good both on the left side and right side.
This straight line has the same brighter both on the left side and right side of the road. Such as our LP3026 led headlight projector lens. But before you sell this mode of the lens, please make sure that your government rule is allowed.