A Service Centre complex was built on one of the major Expressway out of Sydney. The Service Centre complex consists of two sections, one on either side of the Expressway with separate refuelling areas for trucks and cars, separated parking areas, restaurants, giftshops, and workshops.

Consultant A set a night time LA10 noise criteria of 42dB(A), and recommended a kilometre of high noise barriers. The oil company building the Service Centres approached CAMETS to independently review all aspects of the project. Following the review, Consultant A was dismissed from the project and the project was completed using CAMETS.

Table 1 shows a summary of the predictions, assessment, criteria, and testing of the Service Centres from inception through to completion.

Table 1 - Summary of Measured and Predicted LA10 Noise Levels

	Eastern Houses			Western Houses
Source & Acoustic Options All noise levels in dB(A)	Freeway Noise	Noise from Eastern Side	Noise from Western Side	Freeway Noise	Noise from Eastern Side	Noise from Western Side
No Acoustic Treatment	64	52	63	61	49	62
Consultant A's Prediction & Night Time Criteria		42			42
CAMETS Cross Checks of Consultant A's Noise Barriers	64	52	63	58	48	56
Estimated Cost of Consultant A's Noise Barriers	$750,000 - $1,000,000
CAMETS Optimised Acoustic Treatment	64	52	63	56	43	52
Estimated costs of CAMETS Noise Barriers	$375,000 - $500,000
Council Criteria to Nearest Residences on Each Side		49				57
Predicted Noise Levels on Each Side	64	52		58		52
Measured Test Vehicle Noise Levels on Each Side	65	49		57		54

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