[by] Burrell B. Gerhardt [and 4 others].
"September 1973."
"Prepared for U.S. Federal Highway Administration, Research and Development."
Includes bibliographical references (pages 68-69).
Final report.
Cover.
Report No. CDOH-P&R-R&SS-73-5
Print version record.
Mechanical ventilation of tunnels is costly because of the initial installation and the continued maintenance and operation. However, at some tunnel length corresponding to a particular altitude, traffic configuration and topography there is a need for this forced ventilation. This study was undertaken to help determine the pollution concentration in existing tunnels in Colorado, and predict the length of tunnels which will need mechanical ventilation.
