Article 2
Definition of the terms referred in the Road Design Standards:
1. Traffic lane: refers to sections of the road defined by markings or solid objects and other road spaces provided for other vehicle passage.
2. Walkways: refers to road sections allocated for pedestrian passage, overpasses, and pedestrian underpasses.
3. Public facility belt: refers to areas designated for public facilities or planting in the walkways or median islands.
4. Traffic calming zones: refers to certain roads or road sections where vehicles are prohibited from blowing horns or where vehicle speed is limited; moreover, speed reducing facilities are installed.
5. Express ways: refers to arterial roads that provide through traffic across a city or through traffic within a city with full or partial entrance and exit controls.
6. Main roads: refers to arterial roads running within a city area or connecting with neighboring city (town and village) roads.
7. Secondary roads: refers to secondary trunk roads connecting with main roads and service roads running within a city area or connecting with neighboring city (town and village) roads.
8. Service roads: refers to inner city community roads or connecting roads of secondary roads.

Article 5
Design and planning regulations of main roads:
1. Road configuration of the entire main road length shall be uniform; however necessary adjustments may be applied depending on existing circumstances where road crosses special sections or zones.
2. Main roads shall be divided in the middle or between fast and slow lanes. Road width on each traffic direction shall have at least two lanes.
3. Spaces for sidewalks or walkways and public facility belts shall be allocated based on actual requirements.
4. Bus, motorcycle, or bicycle lanes, bikeways or pedestrian walkways may be provided pursuant to the nature of road traffic and actual conditions of the road.
5. Where main road level crosses another main road or secondary road, proper traffic control signs shall be installed; where main road level crosses a service road, make sure that the service road does not cross a median divider or fast and slow lane divider. However, where such crossing is authorized by the competent authorities, proper traffic control sign(s) shall be installed at the intersection of the level crossing.

Article 6
Design and planning regulations of secondary roads:
1. Each side or direction of the road shall have at least a fast lane and a slow lane.
2. Spaces for sidewalks and public facility areas shall be allocated based on actual requirements.
3. Motorcycle or bicycle lanes or bikeways may be provided pursuant to the nature of road traffic and actual conditions of the road.

Article 9
Design speed of urban roads is determined pursuant to the road type and function, terrain category and the following regulations. However, in the event of special changes in road terrain, design speed may be adjusted pursuant to the approval of the competent authority.

Road type and function
Design Speed (KM/HR)
terrain category 　 Express ways　Main roads Secondary roads　Service roads
　　Plain 　　　　　　60-100        50-80 　     40-70 　　　     20-50
　　Hill 　　　 　　　60-80         50-70 　     40-60 　　     　20-40
Mountain ridge 　  　 50-60         40-50 　     30-40　          20-30

Article 10
Regulations governing alignment designs of urban roads:
1. The horizontal alignment design shall be coordinated with the promulgated urban planning.
2. The design speed determines the minimum radius of the horizontal curve of the horizontal alignment.
3. The longitudinal gradient shall match the changes in the site terrain and design speed.
4. The cross slope of the straight section of the lane shall not exceed 4%; maximum cant of the curved section shall not exceed 8%.

Article 11
Lane width regulations of urban roads:
1. Car lane width is determined based on the design speed. For expressway roads, minimum lane width is 3.25 meters; for main roads and secondary roads, minimum lane width is 3 meters, for service roads, minimum lane width is 2.8 meters.
2. Minimum lane width of motorcycle lanes is 1.5 meters.
3. Minimum lane width of bicycle lanes or bikeways is 1.2 meters.
4. Minimum lane width of bus lanes is 3.25 meters; however, minimum lane width for bus lanes in bus stops is 3 meters.

Article 12
Curb parking lot design regulations for urban roads:
1. The curb parking lots are likewise governed by the Parking Lot Laws. Curb parking spaces shall not be allotted in traffic lanes.
2. No curb parking spaces shall be placed in road sections where traffic service level is rated class E or lower.
3. Where slope gradient of the road is greater than 7%, no curb parking spaces shall be placed.
4. When allocating curb parking spaces, parking spaces for cars, motorcycles, bicycles, or bikes shall be defined pursuant to actual parking requirements.

Article 14
Regulations governing the urban road grade separation crossing structural designs:
1. The lateral clearance between the outside wall of urban road grade separation crossing structures and outside wall of building structures shall be at least 4.5 meters for grade separation structures and at least 3 meters for ramp structures.
2. Height clearance of the grade separation crossing over the underlying road shall be at least 4.6 meters. Grade separation crossing sections where large vehicles are prohibited from entering shall have height clearance of at least 0.5 meters added to the height of largest vehicles; moreover, height limiting or warning devices shall be installed.
3. Where level side lanes are constructed, lane width shall be at least 3 meters; moreover, space for U-turn lane shall be allocated.

Article 16
Walkway design regulations for urban roads:
1. Width of the walkway is determined by the volume of pedestrian traffic. Minimum width of sidewalks for pedestrians shall be at least 1.5 meters. However, in road sections where road width is limited with road status, the clear width of the sidewalk shall be at least 0.9 meters, approved by the competent authorities.
2. Where bicycles or bikes are allowed to pass through pedestrian walkways, space design shall not obstruct passage of pedestrians.
3. Longitudinal slope gradient shall not exceed 12% and shall be consistent with the longitudinal slop gradient of the road. Where it is not possible to coordinate sidewalk gradient with road gradient, a different design may be made. Cross slope shall not exceed 5%.
4. The height clearance of the pedestrian passage spaces of walkways shall be at least 2.1 meters.
5. Height of sidewalk curbs shall not exceed 0.15 meter. Curbs constructed as driving guides shall not exceed 0.2 meter. Where crosswalk junctions or areas having different terrains, a slope may be constructed to accommodate the elevation changes.

Article 17
Design regulations for urban road overpasses and pedestrian underpasses:
1. The width of the passage way of overpasses and pedestrian underpasses and the width of the entrance and exit ways shall be at least 1.5 meters. Where entrance or exit is located on a walkway or sidewalk, passage way width after construction shall satisfy the minimum clear width requirement provided in Paragraph 1 of the preceding article.
2. The height clearance of the overpass ceiling and the pedestrian underpass interior space shall be at least 2.1 meters.
3. Where the entrance and exit of overpasses and pedestrian underpasses having a gradual slope construction, the gradient shall not exceed 12%.
4. Hand rails shall be installed in the slope walkway and stairs, means to prevent slipping shall also be provided.

Article 18
In order to ensure the safety of pedestrians, bicycle riders, bikers and motorists, every level of the competent authorities may dedicate traffic calming zones or pedestrian malls in commercial areas, residential areas, school areas and other necessary areas where service roads pass through.

Article 23
Regulations governing the tunnel designs of urban roads:
1. The clear width of the tunnel cross section for tunnels equipped with single lanes shall be at least 5 meters; for tunnels equipped with double lanes, clear width shall be at least 7 meters. Clear width of the maintenance pathway shall be at least 0.7 meter.
2. The perpendicular clearance of the tunnel lane shall be at least 4.6 meters; where entry of large vehicles is prohibited, height clearance shall beat least 0.5 meters added to the height of largest vehicles; moreover, height limiting or warning devices shall be installed at the tunnel entrances.
3. Drainage, ventilation and lighting facilities, traffic monitor and safety facilities shall be constructed or installed pursuant to requirements.

Article 25
Regulations governing the designs of urban road traffic control islands:
1. The design shall meet driving guide, motorist safety, and pedestrian safety requirements.
2. Width of the divider shall be at least 0.5 meter; where public facilities are constructed on divider, minimum width of divider shall be at least 0.8 meter.
3. Area of the channelizing island shall be at least 5 square meters.

Article 28
Under any one of the following circumstances, the entirety or a portion of the Road Design Standards regulations may not be applicable to the urban road in question:
1. Urban roads under the jurisdiction of Kinmen County and Lienchiang County.
2. The improvement, broadening, repair and maintenance of existing urban roads upon the approval of the local competent authority.
3. Urban roads located in special terrains upon approval of the central competent authority.