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Feb 27, 2010
ERP gantry location based on overall traffic condition
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I REFER to Mr Teng Kee Yew's letter, 'Move ERP gantries to slip roads' (Feb 18). He recognises the role of Electronic Road Pricing (ERP) to regulate traffic, but questions the gantry placement along the south-bound Central Expressway (CTE) between Ang Mo Kio Avenue 1 and Braddell Road.
In determining where to install ERP gantries, the Land Transport Authority (LTA) considers the overall traffic condition along a stretch of road rather than specific point locations.
Along the south-bound CTE, gantries are positioned to regulate traffic along different stretches of the expressway. Road users comprise those who travel along the main expressway, as well as those who use the slip roads. The gantry between Ang Mo Kio Avenue 1 and Braddell Road is needed to manage traffic along the stretch of CTE before Braddell Road.
Our traffic monitoring shows that traffic speeds at this location now range between 45kmh and 65kmh, which is within the optimum speed range for expressways. This means current ERP rates have been effective in maintaining the optimum flow of traffic.
We acknowledge that traffic patterns may change due to changes to road network and land developments. That is why LTA monitors traffic conditions regularly and reviews ERP rates every quarter. Should traffic speeds rise above the optimum speed range, we will decrease the ERP rates during the quarterly ERP review exercises. This has been done with other gantries.
Mr Teng is right to point out that traffic accidents and even vehicle breakdowns contribute to traffic slowdowns. LTA's Intelligent Transport Systems Centre monitors traffic conditions on the expressways round the clock.
When the network of surveillance cameras detects an incident, our Expressway Monitoring and Advisory System (Emas) service crew are dispatched immediately and can arrive at the incident scene within eight to 15 minutes to attend to the motorist and minimise traffic disruption.
However, the time taken to clear an incident depends on the nature of the accident. For instance, those involving injury or death will take longer to clear as the process of accident investigation is required before the traffic lane can be reopened for use.
Helen Lim (Ms)
Deputy Director, Media Relations
Land Transport Authority
ERP gantry location based on overall traffic condition
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I REFER to Mr Teng Kee Yew's letter, 'Move ERP gantries to slip roads' (Feb 18). He recognises the role of Electronic Road Pricing (ERP) to regulate traffic, but questions the gantry placement along the south-bound Central Expressway (CTE) between Ang Mo Kio Avenue 1 and Braddell Road.
In determining where to install ERP gantries, the Land Transport Authority (LTA) considers the overall traffic condition along a stretch of road rather than specific point locations.
Along the south-bound CTE, gantries are positioned to regulate traffic along different stretches of the expressway. Road users comprise those who travel along the main expressway, as well as those who use the slip roads. The gantry between Ang Mo Kio Avenue 1 and Braddell Road is needed to manage traffic along the stretch of CTE before Braddell Road.
Our traffic monitoring shows that traffic speeds at this location now range between 45kmh and 65kmh, which is within the optimum speed range for expressways. This means current ERP rates have been effective in maintaining the optimum flow of traffic.
We acknowledge that traffic patterns may change due to changes to road network and land developments. That is why LTA monitors traffic conditions regularly and reviews ERP rates every quarter. Should traffic speeds rise above the optimum speed range, we will decrease the ERP rates during the quarterly ERP review exercises. This has been done with other gantries.
Mr Teng is right to point out that traffic accidents and even vehicle breakdowns contribute to traffic slowdowns. LTA's Intelligent Transport Systems Centre monitors traffic conditions on the expressways round the clock.
When the network of surveillance cameras detects an incident, our Expressway Monitoring and Advisory System (Emas) service crew are dispatched immediately and can arrive at the incident scene within eight to 15 minutes to attend to the motorist and minimise traffic disruption.
However, the time taken to clear an incident depends on the nature of the accident. For instance, those involving injury or death will take longer to clear as the process of accident investigation is required before the traffic lane can be reopened for use.
Helen Lim (Ms)
Deputy Director, Media Relations
Land Transport Authority
