INTERNATIONAL TUNNEL

Waikato Times, Volume 107, Issue 18024, 20 May 1930, Page 3

INTERNATIONAL TUNNEL

UNITED STATES-CANADA. LAST WORD IN MR CONTROL, The world’s first international motor . car tunnel, joining Detrotit, Michigan and \. indsor, Canada, will be opened In October, 1930. The tunnel, which will cost £5,000,000, represents the latest achievement of scientific construction bent to serve automobile travel. It runs under the Detroit River and its construction has 'been a constant struggle against nature. It is a mile and a quarter long, and its lowest point is 45ft below the channel water level. It has a roadway of 22ft and an estimated capacity of 1000 vehicles per hour in either direction, being limited to that number by Customs regulations. New methods of ventilation have been introduced, and engineers say that the air in every section of the tunnel will be entirely free from carbon monoxide gas. In the ventilating towers at each end of the tunnel will be giant fans, six of the blower type and six of the exhaust type. Fresh air will be pumped into the tunnel ancl emitted alongside the roadway at about the level of the ordinary automobile exhaust. Suction fans operating through the upper duct will draw foul air/ through openings in the ceiling slabs, where it will be conveyed into stacks in the ventilation buildings. Approximately one million cubic feet of air per minute will be required under maximum operating conditions, and a complete change of air will bft made each 90 seconds.