The Irvine-Corona Expressway is a proposed road tunnel connecting the cities of Irvin and Corona outside of Los Angeles, California, USA. The tunnel is 18,500 meters long and is proposed to have one bore for vehicular traffic. The roadway is intended to handle two lanes of unidirectional traffic. With 37,500 vehicles a day, projected annual t affic volumes are high. In addition, half of the proposed tunnel alignment is on a 5% grade. Initially, the tunnel owner wanted to ventilate this tunnel from the portal ventilation buildings only. Ultimately a mid-tunnel ventilation building was required to supplement the portal ventilation buildings. The ventilation system proposed for this tunnel will be presented and the challenges in developing the capacity of the system discussed. It was found that management of tunnel heating controls the tunnel ventilation system requirements.
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