Do motorcycle helmets interfere with the vision and hearing of riders?

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Bibliographic Details
Corporate Author: United States. National Highway Traffic Safety Administration.
Format: Government Document Electronic eBook
Published: Washington, DC : U.S. Dept. of Transportation, National Highway Traffic Safety Administration, [1996]
Series:Traffic Tech - technology transfer series ; no. 127
Online Access:CONNECT
Item Description:Title from title screen (viewed Oct. 8, 2008) .
"June 1996."
Physical Description:[2] p. : digital, PDF file.
Format:Mode of access: Internet from the NHTSA web site. Address as of 10/08/08: ; current access is available via PURL.