Free­way all set for mid-year open­ing

Wanneroo Times - - News - Laura Pond

THE Mitchell Free­way ex­ten­sion is tak­ing shape as the $236.3 mil­lion project re­mains on track for com­ple­tion by the mid­dle of this year.

Main Roads spokesman Dean Roberts said nu­mer­ous mile­stones were achieved dur­ing con­struc­tion last year, in­clud­ing mov­ing about 1.7 mil­lion cu­bic me­tres of soil and rocks dur­ing earth­works, in­stalling 54 bridge beams for three new in­ter­changes and build­ing 3.5km of res­i­den­tial noise walls mostly along the western side of the ex­ten­sion.

“All 54 of the project’s bridge beams have used an in­no­va­tive mono­lithic de­sign to re­duce con­struc­tion ma­te­ri­als, in­clud­ing savings of 1300 tonnes of con­crete and 108 tonnes of steel re­in­force­ment,” he said.

“The bridge beams were in­stalled un­der strict rail-shut­down pe­ri­ods and within tight work spa­ces.”

The de­sign of the fu­ture free­way in­ter­changes at Neer­abup and Burns Beach roads and Hes­ter Av­enue in­cor­po­rate round­about-con­trolled on and off ramps rather than hav­ing sig­nals.

Other fea­tures in­clude us­ing open-grade as­phalt in the free­way road sur­face, which is es­ti­mated to re­duce the noise from tyres by a daily av­er­age of about 2.5 deci­bels when com­pared to dense-grade as­phalt.

Mr Roberts said key sus­tain­abil­ity tri­als would get un­der way this year, such as the in­stal­la­tion of LED lights along the free­way. “If the trial is suc­cess­ful, Main Roads will con­sider the op­tion of up­grad­ing the Main Roads net­work to LED light­ing, to re­duce longterm run­ning and main­te­nance costs,” he said.

A 15 per cent mix of re­cy­cled and crushed glass will go into the road sub-base along a 150m strip of Wan­neroo Road as another trial, which could be used to re­duce land­fill, the reliance of vir­gin quarry sites for lime­stone and en­ergy in­volved in pro­duc­ing road build­ing ma­te­ri­als.

The Mitchell Free­way ex­ten­sion to Hes­ter Av­enue is on track to be com­pleted by mid-year.

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