10 Revision 33 October 2022
2.7 Visibility
The design layout of the MegaRail shall comply with the sight distance
requirements set out in CD109 (section 3) which has replaced TD 9.
2.8 Sloping Ground
The ground below the MegaRail shall be near level within the set back and
working width as shown in CD377 figures 3.28 & 3.29.
2.9 MegaRail height
The MegaRail systems should be set to the heights shown on the drawings
with a tolerance of plus or minus 50mm for all systems. Where the kerb
height is less than 100mm and the distance between the face of the beam
and the edge of the adjacent paved area is less than 1.5m the height should
be measured from the edge of the paved area.
Where the kerb height is less than 100mm and the distance between the
face of the beam and the edge of the adjacent paved area is greater than
1.5m the height should be measured from the ground beneath the beam.
See drawing MR-GA-001
On certain systems where the kerb height is more than 100mm and the
distance between the face of the beam and the edge of the adjacent paved
area is less than 250mm the height should be measured from the edge of
the paved area.
Where the kerb height is more than 100mm and the distance between the
face of the beam and the edge of the adjacent paved area is greater than
250mm the height should be measured from the top of the kerb or adjacent
ground level.
See drawing MR-GA-003
See notes on system drawings to determine which method to use.
MegaRail installation and maintenance tolerances
The maintenance tolerance can be used during
installation when the safety barrier height reference
is
changing from carriageway to verge level or when
connecting to an existing VRS.
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