A TRAFFIC report has found a 222hectare development south of Redland Bay will add a massive 116 per cent increase in vehicles on Cleveland-Redland Bay Road and Serpentine Creek Road.
Traffic analysts Veitch and Lister, who do all the road planning for Redland city, forecast the average weekday daily traffic statistics based on an increase of 10,000 people.
The findings were made in a report to Redland City Council for the Shoreline project which includes 4000 houses, 121 of which are “high-density living” and on lots less than 350sq m.
The report also found German Church Road, near the Redland Bay tip, would experience a 34 per cent increase in traffic on completion of Shoreline.
According to the report, Giles Road, voted one of Redland City's most dangerous, will experience a whopping 170 per cent increase in traffic.
Traffic on Mount Cotton Road would increase by 4 per cent and there would be a 116 per cent increase in traffic on Cleveland-Redland Bay Road near the German Church Road tip, according to the Veitch and Lister report.
Shoreline developers said they would "remove the steep hills and dangerous sections" over 3km of Serpentine Creek Road and will rebuild Scenic Road to a modern urban road.
The developers said the Serpentine Creek Road works through the Shoreline estate were estimated to cost over $40m and would be paid entirely by the developer.
The developer, Fox and Bell, also said it would get the state government to reduce the speed limit on Cleveland-Redland Bay Road from 90km/h to 80km/h.
Despite the forecast traffic statistics, another Shoreline traffic report, from Holland Traffic Consulting, said Main Roads Department had no plan to upgrade Serpentine Creek Road “as there are insufficient traffic volumes”.
In March, Redlands MP Peter Dowling said the state had no long-term budget commitment to upgrade to four lanes Cleveland-Redland Bay Road or Serpentine Creek Road, outside the Shoreline development, before 2025.
Shoreline spokesman Garry Hargrave said his company would contribute to improving seven intersections where the housing project would increase traffic by more than 5 per cent.
Those intersections are at Giles Road, Boundary Street and Double Jump Road at Redland Bay.
However, Mr Hargrave said none of the road works would include making Redland Bay Road a dual carriageway.
He said road works would only consist of adding dual stand-up (waiting) lanes at seven intersections along the busy road, the main connection between Redland Bay and Cleveland.
“The deal with Main Roads is that if the development has less than a 5 per cent impact on traffic, the developer is not obliged to carry out any upgrades,” Mr Hargrave said.
“The traffic impact from Shoreline means our responsibility for roads extends from Serpentine Creek Road to Double Jump Road at Redland Bay and all the way to Bryants Road at Cornubia.
“Without the Shoreline project, none of the roads would be upgraded and we’ve always said that this development will not cost the ratepayer or the taxpayer a dollar.”
Springacre and Double Jump roads, both used as rat runs, would also be affected but an analysis for future works was yet to be done and depended on what council decided when it completed is town plan, Mr Hargrave said.
The 13.9km stretch of road from Serpentine Creek Road at Redland Bay to South Street, Cleveland, is predominantly single-lane carriageway.
Traffic has increased along the road after the Redland Bay population doubled from 6000 to nearly 12,000, over the past five years.
Residents have until Thursday, November 27 to submit their views on the development, which Mr Hargrave said was expected to have the first houses built by October.
