GB 5768.4-2017 English PDF

GB 5768.4-2017: Road traffic signs and markings - Part 4: Work zone
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GB 5768.4-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20
R 80
GB 5768.4-2017
Partially replacing GB 5768-1999
Road traffic signs and markings - Part 4: Work zone
ISSUED ON: JULY 31, 2017
IMPLEMENTED ON: FEBRUARY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Composition of work zone ... 6 
5 Road traffic signs and markings in work zone ... 9 
6 General provisions on work zone layout ... 18 
7 Layout requirements for work zones of expressways and arterial highways
... 21 
8 Layout requirements for work zones of two-lane and single-lane highways 28 
9 Layout requirements for urban road work zone ... 30 
Annex A (informative) Figure legends of signs making of work zone ... 33 
Annex B (informative) Safety facilities of road work ... 37 
Annex C (informative) Example of typical work zone layout ... 45 
Bibliography ... 109 
Foreword
All technical content of this Part of GB 5768 is mandatory.
GB 5768 Road traffic signs and markings consists of eight parts:
- Part 1: General;
- Part 2: Road traffic signs;
- Part 3: Road traffic markings;
- Part 4: Work zone;
- Part 5: Speed limit;
- Part 6: Highway-railway grade crossing;
- Part 7: Non-motor vehicles and pedestrians;
- Part 8: School zone.
This Part is Part 4 of GB 5768.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces the part of road construction safety signs in GB 5768-1999
“Road traffic signs and markings”. Compared with the part of road construction
safety signs in GB 5768-1999, the main changes in this Part are as follow:
- changed the colors of work zone marks of road as orange, fluorescent
orange (see 5.1.1);
- changed the shape of “construction sign” as triangle (see 5.1.2);
- changed the shape of “detour sign” as triangle and adjusted the pattern
(see 5.1.4);
- added signs of “decrease number of lanes”, “orange arrow”, “detour”, “linear
induction”, “attention to traffic guiding personnel”, “exit closed”, “exit”,
“pedestrian, non-motor vehicle accesses” (see 5.1.3, 5.1.5, 5.1.6, 5.1.7,
5.1.8, 5.1.9, 5.1.10, 5.1.11);
- changed “mobile construction sign” to “mobile work sign” and changed it to
a triangle shape (see 5.1.12);
- deleted "road closed sign", "lane closed sign", "vehicle slow sign" (see 5.1);
Road traffic signs and markings - Part 4: Work zone
1 Scope
This Part of GB 5768 specifies the requirements for setting of road work zone’s
traffic signs and markings.
This Part is applicable to the setting of traffic signs and markings for works such
as construction and maintenance of roads, urban roads, and places, squares,
public parking lots and other places that are under the jurisdiction of the
organization but allow social vehicles. The settings of traffic signs and markings
for works such as construction and maintenance of other places where motor
vehicles pass can refer to this Part.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB 5768.2, Road traffic signs and markings - Part 2: Road traffic signs
GB 5768.3, Road traffic signs and markings - Part 3: Road traffic markings
GB/T 18833-2012, Retroreflective sheeting for traffic control
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 work zone
A section where traffic is controlled due to operations that affect traffic operation
such as road construction, maintenance.
3.2 long-term work zone
A work area there the total time of setting up the work area, carrying out the
work, and dismantling the work area is greater than 24h at one location.
3.3 short-term work zone
6 General provisions on work zone layout
6.1 The traffic signs, markings and other facilities in work zone are temporary
facilities set during operation. After the completion of the operation, the original
traffic signs, markings and other facilities shall be demolished and restored in
time. See Annex B for other facilities.
6.2 When the traffic signs, markings and other facilities are set in work zone, it
shall start from the warning zone and shall be pushed to the termination zone.
The removal sequence shall be reversed from the setup sequence.
6.3 The width of the motorway adjacent to the work zone on the highway shall
not be less than 3.0m, not less than 2.75m on the urban road; otherwise it shall
close this lane.
6.4 In addition to mobile work, channeling facilities must be set up to separate
the work zone and the traffic flow. When separating the oncoming traffic flow, it
shall use mobile barriers. It can use plastic water injection (sand) barriers. When
the conditions are not met, traffic cones, buckets or columns can be used.
6.5 The setting range of channeling facilities include upstream transition zone,
buffer zone, operating zone and downstream transition zone. Place according
to Figure 1. The spacing between traffic cones, traffic barrels, and traffic
columns shall not be greater than 10m. Conduct appropriate encryption in the
upstream transition zone. The work zone and the temporary work zone within
the intersection of roads shall, according to the actual situation, simplify the
setting of channelizing devices in the upstream transition zone, buffer zone and
downstream transition zone.
6.6 In addition to the mobile work zone, the work zone shall set up traffic signs
in the work zone according to the actual traffic organization:
a) The starting point of the warning zone shall be set with the distance sign
of the working zone to predict the work zone location;
b) When the number of lanes in the work zone is reduced, the sign of
decrease number of lanes shall be set;
c) When the work zone borrows the opposite lane or access road, it shall set
the sign of detour;
d) In the upstream transition zone, the sign of linear induction or of variable
arrow signal shall be set according to the actual situation;
e) When the work zone is long, the starting point of the buffer zone shall be
set with the sign of work zone length;
8.1.1 If necessary, a work zone distance sign can be added at upstream of the
starting point of the warning zone. The distance from the starting point of the
warning zone shall not exceed 500m.
8.1.2 When a single-lane highway occupies part of the road, it shall close the
traffic or temporarily widen it.
8.2 Work zone borrows opposite lane
8.2.1 Prioritize traffic guidance personnel to direct the two-way traffic.
8.2.2 When both ends of the work section can be seen, if there are no traffic
guidance personnel, it is advisable to set the sign of “right of way” and the sign
of “give way” in the transition zones at both ends of work zone.
8.2.3 When the night work meets one of the following conditions, a temporary
signal light can be set:
a) The length of the road that can only be passed in one way affected by
work zone is greater than 30m;
b) The length of the road that can only be passed in one way affected by
work zone is less than 30m and the oncoming vehicles cannot be seen
clearly.
8.3 Work zone is located at plane crossing
8.3.1 It is better to equip with traffic guidance personnel to guide traffic in four
directions.
8.3.2 When the work zone is at an exit of an intersection, construction signs
can be set at the entrances of other three directions. When the work zone is
located in the center of the intersection, construction signs are set in all four
directions.
8.3.3 When the work zone is located at the intersection exit, it can simplify the
upstream transition zone and the buffer zone.
8.3.4 When the work zone is located at the intersection entrance, it can simplify
the downstream transition zone.
8.4 Example of layout of work zone of two-lane and single-lane highways
See Annex C for the example of layout of work zone of two-lane and single-lane
highways.
C.2.2 When the closed inside lane of a four-lane expressway and arterial
highway is working, see Figure C.2 for the example of work zone layout:
a) At the starting point of warning zone, set a work zone distance sign to
notice the work zone location in advance;
b) Near the midpoint of warning zone, set a sign of decrease number of lanes;
c) It shall use plastic water injection (sand) barriers (or traffic cones, traffic
barrels, traffic columns; movable guardrails, if possible) to surround the
upstream transition zone, buffer zone, working zone and downstream
transition zone;
d) It can use hard shoulder to create another lane;
e) Mark out a dividing line to prohibit crossing the same-way vehicle lane in
upstream transition zone, buffer zone, working zone and downstream
transition zone to mark the lanes for vehicles to pass and the closed traffic
area. Forbit the dividing line that prohibits crossing the same-way vehicle
lane to extend a distance before the upstream transition zone and behind
the downstream transition zone. Prohibit vehicles from changing lanes.
Cooperate the dividing line that prohibits crossing the same-way vehicle
lane to set guide arrows to guide vehicles the driving direction;
f) Before the starting point of upstream transition zone, set a speed limit sign
of work zone. Complete the speed limit transition before upstream
transition zone;
g) Within the upstream transition zone, set linear induction signs or variable
arrow signals according to vehicle driving direction;
h) At the starting point of buffer zone, set a work zone length sign to predict
the work zone length;
i) Buffer zone repeatedly sets speed limit signs of work zone;
j) Set up road bars at the front end of working zone;
k) Set a work zone end sign at the end of termination zone to explain the end
location of work zone;
l) Set a speed limit sign at the end of termination zone. The speed limit value
is the original speed limit value of this section.
warning zone, set work zone distance signs to notice the work zone
location in advance;
b) Set a detour sign Figure 4a) near the midpoint of warning zone in closed
direction. Set a sign of decrease number of lanes near the midpoint of
opposite warning zone;
c) It shall use plastic water injection (sand) barriers (or traffic cones, traffic
barrels, traffic columns; movable guardrails, if possible) to surround the
upstream transition zone and downstream transition zone in closed
direction. It shall set upstream transition zone for each closed lane;
d) Use channelizing devices to surround the opposite upstream transition
zone and the opposite buffer zone. It can use movable guardrails when
conditions permit;
e) Two-way traffic flow sections shall use movable guardrails to separate;
f) Mark out a dividing line to prohibit crossing the same-way vehicle lane
before the convergence point in the upstream transition zone to form a
broken-solid line with the original marking to prompt that the vehicles on
the occupied work lane to merge as soon as possible and the vehicles not
on the occupied work lane are prohibited to change the lane. Cooperate
to set guiding arrows to guide vehicles to merge, indicate driving direction;
g) Set two-way traffic signs near the starting point of opposite upstream
transition zone;
h) Set work zone speed limit signs before starting points of closed direction
upstream transition zone and opposite upstream transition zone.
Complete the speed limit transition before upstream transition zone;
i) Within the closed direction upstream transition zone and opposite
upstream transition zone, set linear induction signs or variable arrow
signals according to vehicle driving direction;
j) At the starting point of closed direction buffer zone and opposite buffer zone,
set work zone length signs to notice the work zone length in advance;
k) The closed direction buffer zone and the opposite buffer zone repeatedly
set work zone speed limit signs;
l) Set up road bars at the front end of working zone;
m) At the termination end of the borrowed opposite lane, set linear induction
signs or variable arrow signals as well as guiding arrows to guide vehicles
to drive back to the original lane;
C.2.5 When a six-lane expressway closes one direction to work and borrows
the opposite lane to pass, the examples of work zone layout are as shown in
Figure C.5, Figure C.6:
a) At the starting points of closed direction warning zone and opposite
warning zone, set work zone distance signs to notice the work zone
location in advance;
b) Near the midpoint of closed direction warning zone, set a detour sign
Figure 4a). Near the midpoint of opposite warning zone, set a sign of
decrease number of lanes;
c) It shall use plastic water injection (sand) barriers (or traffic cones, traffic
barrels, traffic columns; movable guardrails, if possible) to surround the
upstream transition zone, downstream transition zone in closed direction.
Set upstream transition zone for each closed lane;
d) Use channelizing devices to surround the opposite upstream transition
zone and the opposite buffer zone. Use movable guardrails when
conditions permit;
e) Two-way traffic flow sections shall use movable guardrails to separate;
f) Mark out a dividing line to prohibit crossing the same-way vehicle lane
before the convergence point in the upstream transition zone to form a
broken-solid line with the original marking to prompt that the vehicles on
the occupied work lane to merge as soon as possible and the vehicles not
on the occupied work lane are prohibited to change the lane. Cooperate
to set guiding arrows to direct vehicles to merge and indica...