National Work Zone Safety Information Clearinghouse is dedicated to providing the transportation construction industry and the general public with comprehensive information to improve motorist, worker and pedestrian safety in roadway work zones.

http://www.workzonesafety.org/

The Manual on Uniform Traffic Control Devices (MUTCD) defines the standards used by road managers nationwide to install and maintain traffic control devices on all streets and highways. The MUTCD is published by the Federal Highway Administration (FHWA), incorporated by the Department of Transportation (DOT) and referenced by the Occupational Safety and Health Administration (OSHA).

http://mutcd.fhwa.dot.gov/

NIOSH has developed a library of diagrams showing the size and shape of the blind spots from a variety of construction vehicles.  This might be useful in looking at your own equipment or helping you in decisions about purchasing new equipment.  Below is a link to this library.

http://www.cdc.gov/niosh/topics/highwayworkzones/BAD/imagelookup.html