Acentech prepared a Technical Noise Study Report for the US-101 / Lost Hills Road Interchange Project located in western Los Angeles County in the City of Calabasas. The project identified improvements necessary for mobility and safety, including the reduction of existing and forecasted traffic congestion at the interchange by adding capacity while minimizing environmental and community impacts for the design year 2040.

The noise study considered seven alternatives: No-Build (Alternative 1); installing Transportation Management Systems (Alternative 2); construction of a new overcrossing and building a four-legged roundabout at the north side and south side of US-101 (Alternative 3); construction of a new overcrossing only (Alternative 4); construction of a new overcrossing, a new partial cloverleaf on-ramp for northbound Lost Hills Road to northbound US-101 and moving access to the residential community to Driver Avenue (Alternative 5); construction of a new overcrossing and moving access to the residential community to Driver Avenue (Alternative 6); and construction of a new overcrossing, a new cloverleaf on-ramp for northbound US-101, and relocating US-101 northbound on-ramp to a new cloverleaf on-ramp for US-101 northbound 500 feet north of Canwood Street (Alternative 7).

Acentech used the FHWA’s highway noise prediction and barrier design program, Traffic Noise Model (TNM), to produce balanced noise barrier designs compatible with California Department of Transportation (CALTRANS) design requirements.