2.6.2 Visibility for
vehicles operating on expressways must be guaranteed.
2.6.3 Regulations on
longitudinal slope
2.6.3.1 Maximum longitudinal
gradient is specified under Schedule 1 and depends on design speed band.
2.6.3.2 Minimum longitudinal
gradient of cut and fill road base segments must be 0,50 %.
2.6.3.3 Minimum longitudinal
gradient of transition segments where lateral gradient is less than 1,00 % must
be 0,50 %.
2.6.3.4 Minimum longitudinal
gradient of expressway segments in tunnels is 0,30 %.
2.6.4 Circular or parabolic
vertical curve is required where reverse curves occur.
2.7 Grade-separated junction,
expressway exits and entries
2.7.1 Grade-separated
junctions are required where expressways intersect other types of road.
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2.7.3 Minimum distance
between connected grade-separated junctions and expressway entries, exits is 4,00
km. Minimum distance between connected grade-separated junctions is 10,00 km or
5,00 km where these junctions are close to major cities, major urban areas, and
important functioning areas.
2.7.4 Technical
specifications applying to connected grade-separated junctions and expressway
entries, and exits.
2.7.4.1 Design speed of
branching roads within range of connected grade-separated junctions is
specified under Schedule 2 below.
Schedule
2 - Design speed of branching roads within range of connected grade-separated
junctions
Characteristics
of connected grade-separated junctions
Design
speed band (km/h)
120
100
80
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80
÷ 50
70
÷ 40
60
÷ 35
(50 ÷ 35)
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.
2.7.4.2 Geometric elements
of branching roads within range of connected grade-separated junctions (radius
of curve, transition curve, superelevation, extension degree, longitudinal
gradient, vertical curve, sight distance) must meet requirements corresponding
to design speed.
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2.8 Surface and base of
expressway
2.8.1 Road base
2.8.1.1 Road base must be
stable, capable of retaining geometric dimensions, sufficiently strong to
withstand vehicular load and natural factors throughout its useful life.
2.8.1.2 Road base must be
calculated, designed, and built on the basis of topographic, geological, and
hydrographic surveying data.
2.8.2 Road surface must be
designed and built in a way that meets strength, integrity, grip, evenness, and
drainage requirements.
2.9 Safety and protection on
expressway
2.9.1 Traffic safety
protection
2.9.1.1 Traffic safety
system must be arranged in a synchronous manner on expressways.
2.9.1.2 Guardrails are
required to prevent people, livestocks, and wild animals from crossing
expressways.
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2.9.3 Directional road
markings and guardrails or traffic cones are required to maintain safety in
operation.
2.9.4 Glare protection
2.9.4.1 Anti-glare measures
are required to negate light emitted by headlamps of opposing vehicles at
night.
2.9.4.2 Visibility in curves
must be inspected where anti-glare measures have been installed.
2.9.4.3 Where median strip
of expressway is at least 12,00 m in width, anti-glare measures are not
required.
2.9.5 Illumination is
required in the following areas on expressway:
2.9.5.1 Where tollbooths are
built.
2.9.5.2 Tunnels.
2.9.5.3 Within range of
connected junctions on expressways.
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2.10 Management, operation,
usage, and maintenance of expressway structures
2.10.1 The management,
operation, usage, and maintenance of expressway structures shall conform to
Decree No. 32/2014/ND-CP dated April 22, 2014 of the Government and guiding
Circulars.
2.10.2 Speed limit on
expressway is determined on the basis of design speed, technical conditions,
weather conditions, climate, vehicle flow, and type of vehicles participating
in traffic on expressway.
2.10.3 Maximum speed limit
on expressway must 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 bee more than 20 km/h apart.
2.10.4 U-turn areas are
required for oversized vehicles in weigh stations.
3. ORGANIZING
IMPLEMENTATION
3.1 The Vietnam Expressway
Authority is responsibility for the implementation of this document.
3.2 In respect of connected
junctions, expressway entries and exits serving socio-economic development of
the area do not meet minimum separation distance mentioned under 2.7.3 hereof,
the Ministry of Transport shall consider projects under their management and
projects under management of local government at request of local government.
3.3 Investment,
construction, management, operation, usage, and maintenance of expressways
shall adhere to this Regulation.
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