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About

Bangalore Elevated Tollway Limited (BETL)

Project Brief

Bangalore Elevated Tollway Limited (BETL) is the Special Purpose Vehicle (SPV) created to undertake the Construction, operation, maintenance of the elevated highway from Silk board junction (Benguluru) to Electronic city (Outer Benguluru) and the operation and maintenance the atgrade section from Silk Board Junction to Attibele junction (near Hosur).

The project entails Improvements at ground level including construction of underpass and construction of elevated highway in Electronic City section and HTMS in Km 8.765 and Km 33.130 of NH-7. The elevated section runs close to 10 km and is intended to relieve the intensity of traffic plying on the stretch. This was one of the longest elevated corridors in India.

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Project Credits

Client : NHAI

  • Project Type: Express Way
  • Length of Elevated Road: 11.5 Km Length
  • Location: Bangalore
  • Consultant: Renardet S.A.
  • Contractor: SOMA / MAYTAS / NCC
  • Lighting: Wipro Ltd
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Lighting for Elevated Highway

The Elevated Highway consists of different areas to be illuminated as per NHAI requirements. The areas to be illuminated are-

  • Approach Road lighting
  • Approach Ramp lighting
  • Truck / Bus Lay bay lighting
  • Lighting for Various descending Ramps at the end of elevated road
  • Main elevated road lighting
  • Under deck lighting of elevated roads
  • Underpass Lighting
  • Service Road Lighting
Lighting Requirements as per NHAI Guidelines:
ParticularsLocations
Elevated HighwayRecessed Lights in Segments for GL RoadService Road at GLUnderpasses (6 nos) (*)
For Bridge DeckFor GL Carriageways
Height of Luminaires9.0 M3.0 M (above Elevated Deck)VariableVariable---
Spacing of Poles34 m c/c on each side34 m c/c on each side34 m c/c on each side34 m---
Wattage of Luminaires250 W HPSV250 W HPSV250 W HPSV250 W HPSV2 x 36 W CFL
Average Illuminance40 Lux30 Lux20 Lux70 Lux
Minimum Illuminance18 Lux19 Lux8 Lux---
Uniformity> 40 %19 Lux> 40 %> 60 %
Design Results Achieved:
ParticularsFor Bridge DeckFor GL Carriage Way and GL Road with Bottom of Bridge Deck (from GL) atFor Service Road at GL with Bottom of Bridge Deck (from GL) at
6-15 M6-10 M10-15 M
Luminaire Cat. No.WST 71250WHT 61250WST 71250WST 71250
Lamp Wattage & Type250 W HPSV-T250 W HPSV250 W HPSV-T
Mounting ArrangementOpposite Pole Mounting on 9 M High Pole.Under Bridge Deck (Opposite)Opposite Pole Mounting at the Top of Bridge Deck on 9 M High Pole used for Illumination of Bridge Deck @ 3 Mtr Height
Length of Pole Bracket1.5 MtrsNot Applicable1.5 Mtrs1.5 Mtrs
Angle of Tilt15 Degrees15 Degrees25 Degrees25 Degrees
IP Protection for LuminaireIP 66IP 66IP 66
Type of InstallationPole MountedSurface mounted on PedestalPole Mounted
Spacing34 M c/c on each side34 M c/c on each side for 10M and above. 22M c/c on each side for 6-10M34 M c/c on each side
Average Illuminance43 Lux40 Lux28 - 29 Lux29 Lux
Minimum Illuminance23 Lux18 Lux14 – 21 Lux22 Lux
Uniformity of Installation0.5370.4520.50 – 0.710.743
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Proposed Solution
  • Wipro proposed solution of High performance Street Lights and Under Carriage Luminaire specially developed for this project to achieve required design results.
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Luminaire Used UNO Street Light

We have proposed Uno range of Street Light luminaires to Main Carriage Way and Service Roads:

  • Die cast aluminium compact and aesthetically designed housing with electrochemically brightened high purity anodised aluminium pot optics reflector
  • IP 66 optically sealed lamp compartment with flat toughened glass and silicon sealent
  • Top maintainable hingable top cover.
  • Anti corrosive stainless steel clamps with gasket to seal lamp holder cap and facilitate lamp replacement
  • Special air breathing filter in lamp holder compartment for better ventilation and for removal of excessive heat from lamp compartment
  • Provision of adjustable lamp position to control distribution of light both on street side and kerb side.
  • Removable control gear for ease of maintenance
  • Heavy duty, low loss inductive copper wound ballast
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Luminaire Used Under Deck Luminaire WHT61250

We have proposed specially developed and designed under deck luminaires for Main Carriage Way below elevated highway:

  • Die cast aluminium compact and aesthetically designed end caps and extruded aluminium housing with electrochemically brightened high purity anodised aluminium pot optics reflector
  • IP 66 optically sealed lamp compartment with flat toughened glass and silicon sealent
  • Top maintainable hingable top cover.
  • Anti corrosive stainless steel clamps with gasket to seal lamp holder cap and facilitate lamp replacement
  • Provision of adjustable lamp position to control distribution of light both on street side and kerb side.
  • Removable control gear for ease of maintenance
  • Heavy duty, low loss inductive copper wound ballast
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Results Achieved
  • Lux levels achieved as per NHAI Standards for the complete areas
  • Lighting Power Density achieved using next High Lumen Output HPSV-T Plus Lamp
  • Specially developed under deck luminaire with vibration dampeners as per NHAI requirements
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Benefits to Client:
  • Proposed solution of Wipro helped getting good lighting for the elevated tollway
  • More footfall because of well illuminated elevated, under deck roads
  • Energy saving through use of next generation HPSV-T Plus Lamps
BETL

BETL is one of the first major and prestigious NHAI projects done by Wipro. Since then we have added various prestigious NHAI projects like NH3-Dhule stretch, NH-8 Kishangarh Beewar stretch to our portfolio making it an established player in Highway lighting.

With the addition of latest generation high performance street lighting products, Wipro continue to build its credentials.