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MINISTRY OF
TRANSPORT OF VIETNAM
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THE SOCIALIST
REPUBLIC OF VIETNAM
Independence - Freedom – Happiness
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No.
57/2024/TT-BGTVT
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Hanoi, November
15, 2024
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CIRCULAR
ON
NATIONAL TECHNICAL REGULATION ON EXPRESSWAY
Pursuant to the Law on Road dated June 27, 2024;
Pursuant to the Law on Standards and Technical
Regulations dated June 29, 2006;
Pursuant to Decree No. 56/2022/ND-CP dated
August 24, 2022 of the Government on functions, responsibilities, jurisdiction
and organizational structure of the Ministry of Transport;
At the request of the head of Science –
Technology and Environment Authority and Director General of Vietnam Expressway
Authority;
The Minister of Transport promulgates the
Circular on national technical regulation on expressway.
Article 1. The National Technical Regulation on Expressway is attached
to this Circular.
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Article 2. Effect
1. This Circular comes into force from January 01,
2025.
2. This Circular replaces Circular No.
06/2024/TT-BGTVT dated March 31, 2024 of the Minister of Transport on National
Technical Regulation on Expressway QCVN 115:2024./.
PP. MINISTER
DEPUTY MINISTER
Nguyen Duy Lam
QCVN 117:2024/BGTVT
NATIONAL
TECHNICAL REGULATION ON EXPRESSWAY
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Foreword
The QCVN 117:2024/BGTVT “National Technical
Regulation on Expressway” is compiled by the Vietnam Expressway Authority,
approved by the Science – Technology and Environment Authority, appraise by the
Ministry of Science and Technology, and promulgated by the Ministry of
Transport under Circular No. 57/2024/TT-BGTVT dated November 15, 2024.
This Technical Regulation replaces QCVN
115:2024/BGTVT – Technical Regulation on Expressway attached to Circular No.
06/2024/TT-BGTVT dated March 31, 2024 of the Minister of Transport).
Table of Contents
1. GENERAL PROVISIONS
2. TECNICAL PROVISIONS
3. IMPLEMENTATION
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NATIONAL
TECHNICAL REGULATION ON EXPRESSWAY
National
Technical Regulation on Expressway
1. GENERAL PROVISIONS
1.1. Scope
This Regulation prescribes technical requirements
in construction, management, operation, usage, and maintenance of expressways
(excluding urban expressways).
1.2. Regulated entities
This Regulation applies to organizations and
individuals related to the investment, construction, management, operation,
usage, and maintenance of expressways.
1.3. Definitions
For the purposes of this Circular, the terms below
shall be construed as follows:
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A breakdown lane is a lane that serves as emergency
parking space for accident-stricken vehicles, accommodates operation of rescue
vehicles and where other vehicles are prohibited from operating on and parking
on except for priority vehicles.
1.3.2. Design vehicle flow
Design vehicle flow is a number of cars equivalent
derived from the number of other vehicles passing through a cross section over
a unit of time in the future year.
1.3.3. Future year
The future year refers to the 20th year
from the year in which expressway construction is expected to finish.
1.4. Design speed of expressway
Design speed of expressway is divided into 3 bands:
The 120 band has design speed of 120 km/h;
The 100 band has design speed of 100 km/h;
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An expressway may consist of segments with varying
speed bands as long as each segment lasts at least 15 km in length and
differences in design speed of two adjacent segments do not exceed 20 km/h.
Where an expressway is subject to more than one band (20 km/h), a transition
segment of at least 2 km in length with intermediate design speed is required.
1.5. Reference documents
Reference documents used in this document include:
- QCVN 41:2024/BGTVT “National Technical
Regulation on Traffic Signs and Signals’’.
- QCVN 43:2024/BGTVT “National Technical
Regulation on Roadside Station”.
- QCVN 07-4:2023/BXD “National Technical
Regulation on Technical Infrastructure System - Urban Transportation Works”.
- QCVN 116:2024/BGTVT “National Technical
Regulation for Weigh Station on Road’’.
- QCVN 02:2022/BXD “National Technical
Regulation on Natural Physical and Climatic Data for Construction’’.
2. TECNICAL PROVISIONS
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2.1.1. Structure of expressway must meet
integrity and stability requirements and conform to natural conditions.
2.1.2. Expressway contains at least 4 lanes
(2 lanes per direction of travel) and is outfitted with continuous breakdown
lanes (except where: the expressway crosses a bridge with at least 150 m in
span or 50 m in pier height; the expressway travels in tunnel; deceleration and
acceleration lanes are located on the expressway; climbing lanes are located on
the expressway).
2.1.3. Structures attached to expressway
include: collector road and frontage road; traffic management and coordination center;
roadside stations, parking spaces; stop-less electronic tolling system; weigh
stations; barriers and other structures of expressways.
2.1.4. Cross-section of expressway may rest
on the same road base or two separate road bases if two directions of travel
are situated on two separate road bases.
2.2. Cross-section of
expressway
2.2.1. Number of lanes is determined on the
basis of design vehicle flow and is at least 2 lanes per direction of travel.
Width of a lane is at least 3,75 m for band 120, band 100 expressways and at
least 3,50 m for band 80 expressways (including band 60 sections).
2.2.2. Width of breakdown lanes is at least
3,00 m for band 120 and band 100 expressways and at least 2,50 m for band 80
expressways (including band 60 sections).
2.2.3. Median strip
2.2.3.1. Median strips (consisting of
medians and safety strips on both side of the medians) are required to separate
two directions of travel. Width of safety strips is at least 0,75 m for band
120 and band 100 expressways and at least 0,50 m for band 80 expressways
(including band 60 sections). Median strips are designed so to meet safety
requirements.
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2.2.4. Width of earthen strips is at least
0,75 m; grass or other surface covering materials are used to prevent erosion.
2.3. Cross-section of
expressway bridge and tunnel
2.3.1. Cross-section of expressway segments
on bridges must contain all elements similar to that of the main segment. Where
bridge span is at least 150,0 m in length or bridge pier is at least 50,0 m in
height and breakdown lanes are not available, a transition segment from
expressway cross-section tapered towards the bridge segment is required.
2.3.2. Cross-section of expressway segments
in tunnels
2.3.2.1. Cross-section of expressway
segments in tunnels must have sufficient width to accommodate all elements
similar to those in main expressway segments including footpaths (for
maintenance and evacuation purposes). Where expressway segments in tunnels do
not accommodate breakdown lanes, safety strips whose width conforms to design
speed of the expressways are required.
2.3.2.2. Where expressway segments in
tunnels are at least 1000,0 m in length and do not accommodate breakdown lanes,
an emergency refuge area of a minimum length of 30,0 m and minimum width
conforming to design speed of expressways is required every 500,0 m in
expressway length or less.
2.4. Collector road and frontage road are required to
accommodate travel demands of inhabitants living in areas affected by and
separated by expressways.
2.5. Geometric elements of
expressway
2.5.1. Geometric elements of expressway
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No.
Parameter
Unit
Design speed
band (km/h)
1
Design speed Vtk
km/h
120
100
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2
Maximum superelevation gradient isc
not greater than
%
8
8
8
3
Minimum radius Rmin corresponding to isc
= +8%
m
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450
240 (140)
4
Radius corresponding to isc = +2%
m
3000
2000
1300 (700)
5
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m
5500
4000
2500 (1500)
6
Minimum length of transition curve corresponding
to Rmin
m
210
210
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7
Minimum stopping sight distance
m
210
160
110 (75)
8
Maximum uphill gradient
%
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5
6
9
Maximum downhill gradient
%
5,5
6
6
10
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m
12000
6000
3000 (1500)
11
Regular minimum radius of summit-type vertical
curve
m
17000
10000
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12
Limit minimum radius of valley-type vertical
curve
m
4000
3000
2000 (1000)
13
Regular minimum radius of valley-type vertical
curve
m
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4500
3000 (1500)
14
Limit minimum length of vertical curve
m
100
85
70(50)
15
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m
250
210
170 (120)
1. Values contained in brackets correspond to a
design speed of 60 km/h.
2. Length of transition curve must be calculated
so to ensure safety and convenience. Transition curve is not required where
superelevation is not necessary.
2.5.2. Visibility for vehicles operating on
expressways must be guaranteed.
2.5.3. Regulations on longitudinal slope.
2.5.3.1. Maximum longitudinal gradient is
specified under Table 1 and depends on design speed band.
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2.5.3.3. Minimum longitudinal gradient of
transition segments where lateral gradient is less than 1,00 % must be 0,50 %.
2.5.3.4. Minimum longitudinal gradient of
expressway segments in tunnels is 0,30 %.
2.5.4. Circular or parabolic vertical curve
is required where reverse curves occur.
2.6. Grade-separated
junction, expressway exits and entries
2.6.1. Grade-separated junctions are
required where expressways intersect other types of road.
2.6.2. Where expressway is above other
roads, clear height corresponding to technical grade of the roads below must be
guaranteed.
2.6.3. Minimum distance between connected
grade-separated junctions and expressway entries, exits is 4,0 km. Minimum
distance between connected grade-separated junctions is 10,0 km or 5,0 km where
these junctions are close to major cities, major urban areas, and important
functioning areas. In cases where there is a need for serving national purposes
or special purposes to develop local socio-economy, minimum distance between
connected grade-separated junctions is allowed to be reduced but required to be
higher than 3,0 km.
2.6.4. Circular or parabolic vertical curve
is required where reverse curves occur.
2.6.4.1. Design speed of branching roads
within range of connected grade-separated junctions is specified under Table 2
below.
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Characteristics
of connected grade-separated junctions
Design speed
band (km/h)
120
100
80
Connecting expressways with other expressways and
level I, level II roads
80 ÷ 50
70 ÷ 40
60 ÷ 35
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Connecting expressways with other roads
60 ÷ 35
50 ÷ 35
40 ÷ 30
(35 ÷ 30)
Values contained in brackets correspond to a
design speed of 60 km/h.
2.6.4.2. Geometric elements of branching
roads including radius of curve, transition curve, superelevation, extension degree,
longitudinal gradient, vertical curve, sight distance must meet requirements
corresponding to design speed.
2.6.5. Deceleration and acceleration lanes
are situated where appropriate on expressway entries and exits.
2.7. Surface and base of
expressway
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2.7.1.1. Road base must be stable, capable
of retaining geometric dimensions, sufficiently strong to withstand vehicular
load and natural factors throughout its useful life.
2.7.1.2. Road base must be calculated,
designed, and built on the basis of topographic, geological, and hydrographic
surveying data.
2.7.2. Road surface must be designed and
built in a way that meets strength, integrity, grip, evenness, and drainage
requirements.
2.8. Safety and protection on
expressway
2.8.1. Traffic safety protection
2.8.1.1. Traffic safety system must be
arranged in a synchronous manner on expressways.
2.8.1.2. Guardrails are required to prevent
people, livestocks, and wild animals from crossing expressways.
2.8.2. Warning systems must be installed on
expressways in a manner that adheres to national technical regulation on road
warning.
2.8.3. Directional road markings and
guardrails or traffic cones are required to maintain safety in operation.
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2.8.4.1. Anti-glare measures are required to
negate light emitted by headlamps of opposing vehicles at night.
2.8.4.2. Visibility in curves must be
inspected where anti-glare measures have been installed.
2.8.4.3. Where median strip of expressway is
at least 12,0 m in width, anti-glare measures are not required.
2.8.5. Illumination is required in the
following areas on expressway:
2.8.5.1. Tollbooths.
2.8.5.2. Tunnels.
2.8.5.3. Within range of connected junctions
on expressways.
2.8.6. Noise barriers are required in areas
adjacent to residential areas.
2.9. Maximum speed limit on expressways shall not exceed 120
km/h. Maximum speed limit and design speed must not be more than 20 km/h apart;
maximum speed limit of 2 consecutive segments must not be more than 20 km/h
apart.
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3.1. The Vietnam Expressway Authority is
responsible for the implementation of this Technical Regulation.
3.2. If reference legislative documents in
this Technical Regulation is amended or replaced, the newer documents shall
prevail./.
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