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Last Updated: Friday, February 24, 2017 10:33 AM
Noise and Vibration Studies
This manual contains Caltrans noise analysis procedures, practices, and other useful technical background information related to the analysis and reporting of highway and construction noise impacts and abatement. It supplements and expands on concepts and procedures referred to in the Traffic Noise Analysis Protocol, which in turn is required by federal regulations in 23CFR772. The contents of this document are not official policy, standard, or regulation, and are for informational purposes—unless they are referenced in the Protocol. Except for some Caltrans-specific methods and procedures, most methods and procedures recommended in this document are in conformance with industry standards and practices. This document can be used as a stand-alone guide for highway noise training purposes or as a reference for technical concepts, methodology, and terminology needed to acquire a basic understanding of highway noise and construction noise-related issues.
Caltrans Technical Guidance for the Assessment and Mitigation of the Effects of Traffic Noise and Road Construction Noise on Bats
This manual provides Department engineers, biologists, and consultants with guidance related to the effects of traffic noise and road construction noise on bats. This document covers the sound environment, bat hearing, echo location and communication, effects of highway noise on bats, and presents guidelines for project noise assessment and management. Literature citations and abstracts have been included in Appendix C and constitutes a significant portion of this document. The PDF format of this guidance allows the extensive citations to be easily searchable.
Caltrans Technical Guidance for the Assessment and Mitigation of the Effects of Traffic Noise and Road Construction Noise on Birds
This manual provides Department engineers, biologists, and consultants with guidance related to the effects of traffic noise and road construction noise on birds. This document covers the sound environment, bird hearing, communication, effects of highway noise on birds, and presents guidelines for project noise assessment and management. The PDF format of this guidance allows the document to be easily searched.
Caltrans Vibration Guidance Manual
This manual provides practical guidance to engineers, planners, and consultants who must address vibration issues associated with the construction, operation, and maintenance of Caltrans projects.
Caltrans Traffic Noise Analysis Protocol (Protocol) - May 2011
FHWA approved California DOT noise policy (Protocol) (1.03MB) for new or reconstruction highway projects. This Protocol became effective on July 13, 2011 for all Federal Aid projects. This version of the Protocol was initiated under the revised Title 23, Part 772 Federal Code which became effective July 13th, 2010. This Protocol contains new provisions, updates and clarifications over the older 2006 Protocol.
Reasonableness Allowance - Construction Cost
Cost considerations for determining noise abatement reasonableness are based on an allowance per benefitted receptor. This reasonable allowance maybe adjusted based on the most recent annual Construction Price Index. The annual price index for the fourth quarter of any year is usually posted by February of the following year. The following reasonableness allowances apply:
- The base cost allowance for any 2016 reasonable/feasible analysis should use $80,000.
- The base cost allowance for any 2015 reasonable/feasible analysis should use $71,000.
- The base cost allowance for any 2014 reasonable/feasible analysis should use $64,000.
- The base cost allowance for any 2013 reasonable/feasible analysis should use $55,000.
- The base cost allowance for any 2012 reasonable/feasible analysis should use $55,000.
Noise and Vibration Technical Advisories have been posted at the publications web page.
The following publications pertaining to acoustical and vibration issues are available for downloading:
- 2006 Traffic Noise Analysis Protocol (1.7 mb)
- Noise Abatement Decision Report (NADR) - October 2012 (229 kb)
- Annotated Noise Study Report Outline (NSR) - April 2015 (206 kb)
- 1998 Traffic Noise Analysis Protocol (192 kb)
- 1998 Technical Noise Supplement (1.8 mb)
More publications can be viewed here.
The Division of Environmental Analysis has two on-demand noise training modules for use by the public. These on-demand training courses cover highway traffic noise fundamentals and TNM basics.
- - lead contact for noise, vibration, and bioacoustic questions.
- - secondary contact for noise, vibration, and bioacoustic questions.
For questions regarding the Noise and Vibration web page, contact the webmaster.