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GB 50688-2011 English PDF (GB50688-2011)

GB 50688-2011 English PDF (GB50688-2011)

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GB 50688-2011: Code for design of urban road traffic facility

With a view to maintaining order operation, security, smoothness and low public nuisance of urban road traffic, unifying technical standards of urban road traffic facility design, guiding engineering construction, and achieving comprehensive function of urban road traffic facility, security and practical advanced technology as well as economy and rationality, this code was formulated.
GB 50688-2011
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
UDC
P GB 50688-2011
Code for Design of Urban Road Traffic Facility
ISSUED ON: MAY 12, 2011
IMPLEMENTED ON: MAY 1, 2011
Jointly issued by: Ministry of Housing and Urban-Rural Development of
the People's Republic of China;
General Administration of Quality Supervision,
Inspection and Quarantine of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 General Provisions ... 9
2 Terms and Symbols ... 10
2.1 Terms ... 10
2.2 Symbols ... 12
2.3 Designation ... 13
3 Traffic Survey ... 14
4 Overall Design ... 15
4.1 General Requirements ... 15
4.2 Grading of Traffic Facility ... 15
4.3 Overall Design Requirements ... 16
4.4 Design Interface ... 17
5 Traffic Signs ... 19
5.1 General Requirements ... 19
5.2 Classification and Arrangement ... 19
5.3 Layout Design... 20
5.4 Material ... 22
5.5 Supporting Mode and Structure Design ... 23
6 Traffic Marking ... 24
6.1 General Requirements ... 24
6.2 Marking Arrangement ... 24
6.3 Material ... 26
6.4 Delineator ... 26
7 Protection Facilities ... 28
7.1 General Requirements ... 28
7.2 Crash Guardrail ... 28
7.3 Crash Cushion ... 32
7.4 Delimitation Structure of Collision Protection Facility ... 34
7.5 Pedestrian Guardrail ... 34
7.6 Separate Facility ... 36
7.7 Guard Fence and Anti-fall Net ... 37
7.8 Anti-glare Facility ... 38
7.9 Acoustic Barrier ... 38
8 Traffic Signal Lamp ... 39
8.1 General Requirements ... 39
8.2 Arrangement of Signal Lamp ... 39
8.3 Traffic Signal Control System ... 40
9 Traffic Surveillance and control System ... 41
9.1 General Requirements ... 41
9.2 Management Mode ... 42
9.3 Traffic Surveillance and control Center ... 42
9.4 Message Collection Facility ... 43
9.5 Message Display and Control Facility ... 43
9.6 Message Transmission Network ... 44
9.7 System Link and Safety ... 44
9.8 Main Performance Index of Surveillance and control System ... 45
9.9 Foundation and Piping of Out-field Equipment, Power Supply, Lightning Protection and Earthing ... 45
9.10 Service Message Facility ... 46
9.11 Changeable Message Sign ... 46
10 Service Facility ... 48
10.1 General Requirements ... 48
10.2 Pedestrian Guide Facility ... 48
10.3 Pedestrian Crossing Facility ... 49
10.4 Parking Facility for Non-motor Vehicle ... 51
10.5 Parking Facilities for Motor Vehicle ... 52
10.6 Bus Stop ... 53
11 Road Lighting and Power Transformation and Distribution ... 56
11.1 Road Lighting ... 56
11.2 Lighting Control ... 59
11.3 Power Transformation and Distribution System ... 59
11.4 Energy Conservation ... 60
12 Management Office and Equipment ... 62
12.1 General Requirements ... 62
12.2 Management Office ... 62
12.3 Management Equipment ... 63
Explanation of Wording in This Code ... 64
List of Quoted Standards ... 65
1 General Provisions
1.0.1 With a view to maintaining order operation, security, smoothness and low public nuisance of urban road traffic, unifying technical standards of urban road traffic facility design, guiding engineering construction, and achieving comprehensive function of urban road traffic facility, security and practical advanced technology as well as economy and rationality, this code was
formulated.
1.0.2 This code is applicable to design of traffic facilities for constructed, renovated and extended roads. Urban road traffic facilities shall include traffic signs, traffic markings, protection facilities, traffic signal lamps, traffic surveillance and control systems, service facilities, road lighting and power transformation and distribution as well as management offices and equipment. 1.0.3 Urban road traffic facility shall be designed according to road nature, environment along the line and traffic flow characteristics; and in addition, it shall meet the requirements of relevant planning, overall design of road and energy conservation and environmental protection in the project location area. 1.0.4 The overall dimensions and load of the design vehicle adopted in the urban road traffic facility design shall meet the requirements of the current national standard "Limits of Dimensions, Axle load and Masses for Road
Vehicles" (GB 1589).
1.0.5 The urban road traffic facility shall be designed synchronously with the principal part of the road engineering; and the design is carried out according to the principles of overall design and phased implementation. For the relevant foundation engineering and piping of the principal part of the engineering, they shall be reserved and embedded during implementation of the principal part of the engineering.
1.0.6 The urban road traffic facility design shall meet the requirements of this code as well as those specified in the current national standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Right of way
Right of road user to carry out traffic activities in certain space at certain time according to the requirements of traffic laws and regulations.
2.1.2 Warning sign
The sign used to warn the vehicles and pedestrians for noticing the road traffic. 2.1.3 Prohibition sign
The sign for prohibit or restrict traffic of vehicles and pedestrians.
2.1.4 Mandatory sign
The sign used to direct vehicles and pedestrians.
2.1.5 Guide sign
The sign used to deliver message on road direction, place and distance. 2.1.6 Changeable message sign
Changeable message sign can change its displayed content according to the change of traffic, road and climate.
2.1.7 Active luminous sign
The sign with figures and symbols and can give out light from inside through electric energy or other energy resources; under relatively dark environment, it can be clearly identified.
2.1.8 Retro-reflection
The reflection which the reflecting light reflects from the opposite direction near the opposite direction and returns to the light source.
2.1.9 Delineator
It is used for indicating heading direction of the road and the edge contour, and is designed with retro-reflection characteristics or initiative lighting function. 2.1.10 Roadside clear zone
2.1.20 Delimitation structure
Major structure surrounding clearance of carriage way.
2.1.21 Collision protection facilities for main structure
Collision protection member enhanced on the major structure easy to be
collided.
2.1.22 Collision protection facilities for subsidiary structure
Collision protection facility arranged independently ahead of the major structure easy to be collided for protecting the major structure.
2.1.23 Guard fence
Fence arranged for preventing pedestrians and non-motor vehicles from
entering into the expressway, ramp or other prohibited area.
2.1.24 Acoustic barrier
A specially designed acoustical baffle placed between the noise source and the sound receiving point.
2.1.25 Traffic surveillance and control
A kind of technical measure for operation and management of road traffic provided for the traffic manager through collection, treatment and launching of traffic message.
2.2 Symbols
Eav - average illuminance
Emin - minimum illuminance
Evmin - minimum vertical illuminance
SR - surround ratio
TI - increase of glare limitation value
UE - uniformity of illuminance
UL - longitudinal uniformity of luminance
UO - overall uniformity of luminance
3 Traffic Survey
3.0.1 Traffic survey shall be carried out for urban road traffic facility design. 3.0.2 Traffic survey content shall cover the road network state in the location area, the current state of land use along the line, the environment along the line, the road and traffic conditions, the urban planning and the road network planning. Except the design road itself, the surrounding area having effect on the design road shall also be covered.
3.0.3 The following conditions shall be analyzed on the basis of investigation and data collection in design of constructed road traffic facilities:
1 Social economy, traffic development, topography, climate and weather in the located area of the project as well as the land development and utilization conditions along the line of the project;
2 Relevant surrounding road grade, alignment, cross section arrangement and traffic facility arrangement conditions;
3 Main road traffic characteristics, traffic organization and management situation surround the project;
4 Status, function and road grade of the project in the planning of road network;
5 Forecast traffic volume, traffic organization and traffic characteristics of the project.
3.0.4 For design and investigation content of traffic facilities in renovated and extended road engineering, except the information required by the new
engineering, the following contents shall also be supplemented in case of need: 1 Conditions of the existing road traffic facilities;
2 Conditions of the existing road traffic;
3.0.5 In renovation engineering design of road traffic facilities, the information such as the existing geometric conditions of road, traffic volume, composition, flow characteristics and accident shall be analyzed comprehensively; and moreover, the predicted traffic information shall be analyzed and judged. 4 Overall Design
4.1 General Requirements
4.1.1 Overall design of the urban road traffic facility shall meet the requirements of the overall objectives such as security, smoothness, environment protection and sustainable development.
4.1.2 Overall design of the urban road traffic facility shall coordinate with the design of the principal part of the road engineering, according to road function and its function in the urban road network, the factors such as design, work, maintenance, operation, management as well as short-term and long-term are comprehensively considered so as to exactly embody the intention of the main design for the road engineering.
4.1.3 Urban road traffic facilities shall not only maintain the respective characteristics and relative independence, but also match and coordinate with each other, so that they become a unified, coordinated and complete system engineering.
4.2 Grading of Traffic Facility
4.2.1 Overall planning and design shall be carried out for urban road traffic facility design according to the grade.
4.2.2 Grade of urban road traffic facility shall be divided into Grades A, B, C and D, and shall meet the following requirements:
1 For Grade A facilities, signs, markings, isolation and protection facilities with improved system shall be arranged; central separate crash guardrail and necessary anti-glare facility must be arranged continuously in the central strip; and crash guardrail must be arranged at roadside for bridge, high embankment as well as road section with side road and side walk beside which may
endanger life and structure safety after crash; signs for guiding and prohibition shall be arranged continuously for the grade-separated junction and the surrounding road network; delineator shall be arranged continuously on both sides of main road and ramp carriage way; branching triangle end at exit shall be provided with eye-catching warning and collision protection facility; ramp control signal lamp shall be arranged for actually controlled ramp; the traffic surveillance and control system shall be arranged in accordance with Grade II; and the medium-long, long and super-long tunnels shall be arranged in
accordance with Grade I;
2 For Grade B facilities, improved signs, markings, as well as necessary isolation and isolation and protection facilities shall be arranged; road section 4.3.2 The interface and joint between the overall design and the principal part of the engineering design shall be defined, and moreover, the specialized design interface and joint of urban road traffic are coordinated so as to avoid interference among facilities.
4.3.3 In the overall design, professional traffic facility design plan shall be developed by organizing traffic facilities, the connection and assistance between facilities are coordinated.
4.3.4 For the overall design, the road traffic facility design plan shall be optimized and perfected according to the road service level of principal part of the engineering design and security assessment conclusion.
4.3.5 Functional requirements on evacuation, salvage and rescue under special traffic safety or emergency occasions shall be proposed in the overall design. 4.4 Design Interface
4.4.1 When traffic signs, delineators, protection facilities, traffic signal and monitor system field equipment, lighting and power transformation and
distribution facilities are arranged on road structure or bridge, tunnel structure, the designer of the traffic facilities shall provide the arrangement stake No., reserved hole size, structural gravity and load-carrying conditions; the design of embedment and reserve shall be carried out by the designer of the principal part of the engineering while he is designing the structure or bridge and tunnel structure. The arrangement and installation of traffic facilities are designed by the designer of traffic facilities.
4.4.2 When protection facilities with crash requirements are arranged on road structure or bridge, tunnel structure, crash grade, geometric size and structure design of collision protection facility as well as design for rigid-soft collision protection transition section at structure end shall be provided with by the designer of traffic facilities; the designer of the principal part of the engineering shall carry out the design of road structure or bridge and tunnel structure. 4.4.3 Communication and signal system piping embedded in road subgrade
cross section shall be determined by the designers of traffic facilities and principal part of the engineering and layout position of the piping is determined by the design of the traffic facility designer; the principal part of the engineering designer shall indicate the sizes and positions of reserved piping, manhole and tube-box in the relevant design drawing, and they shall be listed in the design document of the principal part of the engineering.
4.4.4 Service facilities such as taxicab, bus station, pedestrian crossing facility are covered in the design of principal part of the engineering, and their positions, scales and sizes shall be proposed by the traffic facility designer, after 5 Traffic Signs
5.1 General Requirements
5.1.1 Design of traffic signs shall be in accordance with the relevant laws and regulations of road traffic management and traffic organization management plans, and concisely and accurately deliver message such as right of way, rules of road as well as route indication to road users; and guarantee traffic smoothness and travel safety.
5.1.2 Message delivered by other management facilities such as traffic signs and traffic markings shall be consistent and supplement each other.
5.1.3 Traffic signs shall not deliver message irrelevant with road traffic. 5.1.4 Mandatory signs for emergency, fire protection and risk prevention in tunnel shall be active luminous signs or illuminated signs.
5.1.5 Traffic signs shall not intrude into delimitation of road construction. 5.2 Classification and Arrangement
5.2.1 According to the function, traffic signs shall be divided into main one and auxiliary one, the former one covers warning sign, prohibition sign, mandatory sign, guide sign, tourist area sign, operating area sign and announcement sign; the auxiliary sign is attached under the latter one for giving auxiliary description. 5.2.2 According to the display mode of layout content, traffic signs shall be divided into static ones and changeable message ones.
5.2.3 Arrangement of traffic signs shall meet the following requirements: 1 Factors such as urban scale, characteristics, road network facility layout, road grade, geometric conditions, traffic conditions, road user demands, environment and climate shall be considered comprehensively;
2 Traffic laws and safety requirements shall come first in arrangement of signs;
3 Message display of sign shall be explicit, continuous and systematic, the phenomena of insufficient or overloading message shall be avoided; and what's more, important message shall be displayed in repetition;
4 Under dynamic condition, legibility of road user shall be given full
consideration, namely the time and advance range necessary for users to find and read signs and then take action under that condition;
5.4.2 Grades 1 ~ 3 reflective films shall be adopted for signs on urban expressway and urban arterial road; and on curve section or other danger road sections, reflective film above Grade 2 is adopted. Reflective film above Grade 4 shall be adopted for signs on urban secondary trunk road and roads of lower grade.
5.4.3 Underplate and supporting structure of sign should be made of light material and structure, and meet the requirements of strength, rigidity, durability and corrosion resistance.
5.4.4 Display mode and material for board of changeable message sign shall be selected according to requirements of type, content displayed, control mode, environmental protection and energy conservation on signs.
5.5 Supporting Mode and Structure Design
5.5.1 According to requirements of importance of message that the sign
delivers, layout size, traffic volume lane number, designed wind speed, roadside conditions and suspension position, sign board may be adopted with supporting modes such as column type, cantilever type, frame type or adhesion type.
5.5.2 Design for supporting structure of sign shall be sorted according to supporting mode and board surface size of the sign. The upper structure, post, transom and the connection are designed, and moreover, the deformation and strength are calculated and checked respectively; for the substructure, its design of strength, overturning resistance and anti-sliding are calculated and checked, so is the base stress.
5.5.3 In wind load calculation, the designed wind speed shall meet the following requirements:
1 The 50-year 10 min calculated mean maximum wind speed at place 10
m higher than the flat open area in the location area of the sign shall be adopted; 2 When it is lack of observation data of wind speed, the designed wind
speed may be in accordance with the "profile for the National reference wind speed and the reference wind speed", the speed will be adopted after
verification in field survey; however, it shall be not less than 22 m/s. 3 Connection between the sign board and the supporting structure shall be firm and reliable with convenient installation, flat and smooth board surface and easy maintenance.
6 Traffic Marking
6.1 General Requirements
6.1.1 Marking shall meet the functional requirements of road usage, and deliver relevant rule, warning and guideline to road users.
6.1.2 Marking may be used in conjunction with the sign or used exclusively. 6.1.3 Marking shall be able to be identified clearly, and meet the requirements of legibility in daytime, rain day and nighttime. Urban expressway and arterial road shall be arranged with reflective traffic markings.
6.2 Marking Arrangement
6.2.1 Traffic markings of general road section of monitor shall meet the following requirements:
1 For urban motor vehicle road of two-way traf...

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