Complete list of road greening design specifications!

Source: Plant Frontier

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1. Road greening rate index


The road greening rate should comply with the following provisions

●The greening rate of landscaped roads shall not be less than 40%;

● The greening rate of roads with a red line width greater than 50m shall not be less than 30%;

● The greening rate of roads with a red line width of 40-50m shall not be less than 25%;

●The greening rate of roads with a red line width of less than 40m shall not be less than 20%.

2. Road Green Belt Design

3. Traffic Island Green Space Design

Traffic island is a roundabout where 4 roads meet. The diameter should be 40-50m. It is the most common traffic square. The key points of greening traffic island are:

● For safety reasons, there are no crosswalks and pedestrians are not allowed to enter the square. The decorative function of greening exceeds its functional role, so it is often referred to as a pearl on the green landscaping.

● The height of the plants should gradually decrease from the center to the periphery. Shrubs or flower beds around the periphery should not exceed 1m. The square ground is paved with lawns. Various flower beds are required to have exquisite colors and patterns and be well managed to represent the appearance of the city.

● Fountains, pools, sculptures, etc. can be added to city centers or traffic squares with heavy traffic to enrich the three-dimensional landscape.

●The plant configuration around the traffic island should enhance the guiding effect, and a transparent configuration should be adopted within the sight distance of the vehicle.

●The central island green space should maintain clear driving sight between intersections and be arranged as a decorative green space.

●Ground cover plants should be arranged on guide island green areas.

4. Square greening design

●Square greening should be designed according to the function, scale and surrounding environment of each type of square.

●The greening of the square should facilitate the gathering and distribution of people and vehicles.

● Tall trees should be planted around public activity squares. The concentrated green space should not be less than 25% of the total area of ​​the square, and should be designed as an open green space with sparse and transparent plant configuration.


V. Road greening and related facilities

Voltage (kv)

1—10

35—110

154—220

330

Minimum vertical distance (m)

1．5

3．0

3．5

4．5

Pipeline Name

Distance from tree center (m)

Distance from the center of the bush (m)

Power Cable

1．0

1．0

Telecommunication cables (direct buried)

1．0

1．0

Telecommunication cables (pipes)

1．5

1．0

Water supply pipeline

1．5

—

Stormwater pipes

1．5

—

Sewage pipes

1．5

—

Gas pipeline

1．2

1．2

Thermal pipes

1．5

1．5

Drainage blind ditch

1．0

—

● When encountering special circumstances that cannot meet the standards specified in the above table, the minimum distance from the center of the root neck of the greening tree to the outer edge of the underground pipeline can be determined according to the provisions of the following table.

Minimum distance from tree root collar to outer edge of underground pipeline

Pipeline Name

Distance from the center of the tree root neck (m)

Distance from the center of the shrub root collar (m)

Power Cable

1．0

1.0

Telecommunication cables (direct buried)

1．0

1.0

Telecommunication cables (pipes)

1．5

1.0

Water supply pipeline

1．5

1.0

Stormwater pipes

1．5

1.0

Sewage pipes

1．5

1.0

Facility Name

Distance to tree center (m)

Distance to the center of the bush (m)

Fences less than 2m high

1．0

—

retaining wall

1．0

—

Street light pole

2．0

—

Power and telecommunication poles

1．5

—

Fire hydrant

1．5

2．0

Measuring level points

2．0

2．0

6. Road greening planning and design should follow the following basic principles:
1. Road greening should be dominated by trees, with a combination of trees, shrubs and ground cover plants, and bare soil should not be allowed;

VII. Related terms

●Road green space: land within the scope of roads and squares that can be greened. Road green space is divided into road green belts, traffic island green space, square green space and parking lot green space.

●Road green belt: a strip of green land within the red line of the road. Road green belts are divided into vehicle separation green belts, roadside tree green belts and roadside green belts.

● Separation green belt: A separation belt between carriageways that can be greened. The middle separation green belt is located between the upstream and downstream motor vehicle lanes; the side separation green belts are located between the motor vehicle lane and the non-motor vehicle lane or between motor vehicle lanes in the same direction.

●Roadside tree green belt: a green belt located between the sidewalk and the road, planted mainly with roadside trees.

●Roadside green belt: A green belt on the side of the road, laid out between the edge of the sidewalk and the road red line.

● Traffic island green space: traffic island land that can be greened. Traffic island green space is divided into central island green space, guide island green space and three-dimensional intersection green island.

●Central island green space: Central island land that can be greened at the intersection.

●Guide island green space: guide island land located at the intersection that can be greened.

●Grasscross green island: green space enclosed by interchange main roads and ramps.

●Square and parking lot green space: green space within the scope of square and parking lot.

●Road greening rate: the percentage of the sum of the widths of various green spaces within the road red line to the total width.

●Garden landscape road: A road located in key sections of the city that emphasizes the green landscape along the road and reflects the city’s style and greening characteristics.

● Decorative green space: Green space that is mainly used to decorate and beautify the street scene and is not allowed to be entered by pedestrians.

●Open green space: Walking trails are laid in the green space, and benches are set up for pedestrians to enter for sightseeing and rest.

● Transparently arranged trees are arranged in a way that their crowns do not block the driver’s line of sight within a range of 0.9m in width and 3.0m in height from the adjacent motor vehicle road surface.

8. Tree Species and Ground Cover Plant Selection

●Road greening should select plant species that are adapted to road environmental conditions, have stable growth, high ornamental value and good environmental benefits.

●In cities in cold and snowy areas, deciduous trees should be chosen for green belts and roadside trees.

●Roadside trees should be deep-rooted, high-branched, large-crowned, shady, robust, adaptable to urban road conditions, and with fruit drops that do not cause harm to pedestrians.

● Flowering shrubs should be selected with lush flowers and leaves, long flowering period, strong growth and easy management.

● Hedge plants and foliage shrubs should be selected from species with strong sprouting ability, lush branches and leaves, and resistance to pruning.

● Ground cover plants should be woody or herbaceous foliage and flowering plants with dense stems and leaves, strong growth, few pests and diseases, and easy management. Among them, lawn ground cover plants should be selected from species with strong sprouting ability, high coverage rate, tolerance to pruning, and long green period.

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