Road
Overview
A road (도로, road) is a linear structure artificially constructed to allow the movement of people or vehicles. Roads are the most basic infrastructure of land transportation, serving as a shared space for various modes of transport such as cars, bicycles, and pedestrians. Beyond being simple travel routes, roads are a key axis of economic activity, social exchange, and logistics distribution, directly influencing national development and the quality of life of citizens.
Main Content
1. Definition and Classification of Roads
According to the Road Act (도로법), roads are classified into expressways, national highways, special city/metropolitan city roads, provincial roads, city roads, county roads, and district roads. They are also divided by function into expressways, arterial roads, sub-arterial roads, collector roads, and local roads. Expressways are designed for long-distance high-speed travel, with limited access points and high design speeds. National highways serve as arterial roads connecting major cities and regions. Provincial roads are managed by local governments and handle traffic within regions.
2. Components of a Road
A road generally consists of a roadway (vehicle travel space), sidewalk (pedestrian space), median strip, shoulder, drainage facilities, bridges, tunnels, intersections, traffic lights, and signs. The roadway is further divided into lanes, which regulate the direction and speed of vehicles. Sidewalks are separated from the roadway by curbs to ensure pedestrian safety. The median strip prevents collisions between vehicles traveling in opposite directions, and the shoulder provides space for vehicles to stop in emergencies. Drainage facilities quickly remove rainwater to prevent slipperiness and flooding on the road surface.
3. Road Design and Construction
Road design considers traffic volume, terrain, environment, cost, and safety comprehensively. The design speed is determined by the road's grade and function: expressways are typically designed for 100–120 km/h, national highways for 60–80 km/h, and provincial roads for 40–60 km/h. Road surfaces primarily use asphalt concrete (asphalt pavement) and cement concrete (concrete pavement). Asphalt pavement is quick to construct, quieter, and easier to maintain, while concrete pavement offers superior durability and load-bearing capacity. Recently, eco-friendly technologies such as recycled asphalt, permeable pavement, and low-noise pavement have been introduced.
4. Road Safety and Traffic Management
For road safety, traffic signals, speed limits, safety signs, speed cameras, median strips, and guardrails are installed. Intelligent Transport Systems (ITS) enhance road efficiency and prevent accidents through real-time traffic information collection, signal control, incident detection, and traffic flow optimization. Recently, smart road technology has advanced, with active research on Vehicle-to-Infrastructure (V2I) communication to reduce accident risks and alleviate traffic congestion.
5. Economic and Social Impacts of Roads
Roads have significant economic effects, including reduced logistics costs, improved regional accessibility, tourism promotion, and job creation. Areas with developed road networks see concentrated commerce and industry, and increased real estate values. However, road construction can cause environmental damage, noise pollution, air pollution, and ecosystem fragmentation. Therefore, recent road planning necessarily considers environmental impact assessments and the installation of ecological corridors (eco-bridges).
6. Major Roads of the World
The longest road in the world is the Pan-American Highway (approximately 48,000 km), connecting the Americas, and the longest expressway is Australia's Highway 1 (approximately 14,500 km). South Korea's Gyeongbu Expressway (Seoul–Busan, approximately 416 km) is the country's first expressway and has become a symbol of economic development since its opening in 1970. Germany's Autobahn is famous for sections without speed limits, and Japan's Tomei Expressway is a key artery connecting Tokyo and Nagoya.
Latest Trends
As of 2024–2025, major trends in the road sector include smart roads, electric vehicle (EV) charging infrastructure, autonomous vehicle adaptation, and eco-friendly pavement technologies. Smart roads use sensors, IoT, and AI to analyze traffic flow in real time, predict accidents, and automatically monitor road conditions. With the expansion of EV adoption, the installation of fast-charging stations at highway rest areas and major roadsides is accelerating. To commercialize autonomous vehicles, improvements in road marking precision, establishment of V2X communication infrastructure, and adoption of digital twin technology are being pursued. Additionally, in line with carbon neutrality goals, eco-friendly technologies such as roads using renewable materials, solar roads, and heat-absorbing roads are being researched and applied. South Korea plans to expand the smart road system to all national expressways by 2025 and is increasing pilot operation sections for autonomous vehicles.
Related Topics
- [[Expressway]]
- [[Traffic Engineering]]
- [[Autonomous Vehicle]]
- [[Infrastructure]]
- [[Urban Planning]]
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