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Raised Pedestrian

The document outlines the construction methodology for a raised pedestrian crossing, which enhances safety by elevating the crossing to sidewalk level. It details the necessary materials, equipment, and step-by-step construction processes, including site preparation, excavation, asphalt layering, and integration with existing sidewalks. Safety measures during construction are also emphasized to ensure a durable and visible crossing.

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Victor Thobias
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11 views3 pages

Raised Pedestrian

The document outlines the construction methodology for a raised pedestrian crossing, which enhances safety by elevating the crossing to sidewalk level. It details the necessary materials, equipment, and step-by-step construction processes, including site preparation, excavation, asphalt layering, and integration with existing sidewalks. Safety measures during construction are also emphasized to ensure a durable and visible crossing.

Uploaded by

Victor Thobias
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Construction Methodology for Asphalt Raised Pedestrian

Crossing

1. General

A raised pedestrian crossing is a traffic-calming measure designed to


enhance pedestrian safety by elevating the crossing to sidewalk level,
forcing vehicles to slow down. The construction involves asphalt paving with
proper road markings and signage.

2. Materials & Equipment

 Materials:

o Asphalt (Bituminous Mix: BC or DBM)


o Primer/Tack Coat (Bitumen Emulsion)
o Kerbstones (if required)
o Road markings (thermoplastic paint)
o Reflective road studs (optional)
o Geotextile fabric (if needed for subgrade stabilization)
 Equipment:

o Excavator/Backhoe
o Vibratory Roller (8-10 ton)
o Paver Finisher
o Plate Compactor
o Pneumatic Roller
o Road Marking Machine
o Surveying Instruments (Level, Total Station)

3. Construction Steps

Step 1: Site Preparation & Survey

 Conduct a topographical survey to determine existing road levels.


 Mark the exact location of the raised crossing using stakes and string
lines.
 Ensure proper drainage slope (1-2% away from the center).

Step 2: Excavation & Subgrade Preparation

 Excavate the existing road surface to the required depth (typically 250-
300mm).
 Compact the subgrade using a vibratory roller (95% MDD as per
compaction standards).
 Lay geotextile fabric if the subgrade is weak (optional).

Step 3: Granular Sub-Base (GSB) & Base Course

 Lay and compact a 150mm GSB layer (Granular Sub-Base of crushed


stone).
 Apply a 100mm WMM (Wet Mix Macadam) layer and compact to
required density.

Step 4: Binder & Surface Course (Asphalt Layers)

 Apply tack coat (bitumen emulsion) over the base.


 Lay 60mm DBM (Dense Bituminous Macadam) as binder course
and compact.
 Lay 40mm BC (Bituminous Concrete) as the final wearing course
and compact.
 Ensure proper slope (2-3% crossfall) for drainage.

Step 5: Raising & Transition Slopes

 The raised section should be 100-150mm high (matching sidewalk


level).
 Provide 1:10 taper slopes on approaches for smooth vehicle
transition.

Step 6: Kerbs & Sidewalk Integration (If Applicable)

 Install precast concrete kerbs to retain the asphalt edges (if required).
 Blend the crossing with existing sidewalks for pedestrian accessibility.

Step 7: Road Markings & Signage

 Mark zebra crossings with thermoplastic paint (white/yellow).


 Install "PEDESTRIAN CROSSING" signs with reflective panels.
 Add rumble strips or reflective studs for enhanced visibility.

Step 8: Quality Checks & Opening

 Check compaction, level, and smoothness.


 Allow cooling/setting before opening to traffic.

4. Safety Measures

 Use barricades, cones, and signage during construction.


 Ensure proper lighting for night work.
 Follow OSHA/MoLTS safety guidelines.

5. Conclusion

This methodology ensures a durable, smooth, and safe raised pedestrian


crossing with proper drainage and visibility. Adjustments may be needed
based on site conditions.

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