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Reference.org
Passengers per hour per direction
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<p>Passengers per hour per direction (p/h/d), passengers per hour in peak direction (pphpd) or corridor capacity is a measure of the <a href="/facts/Route_capacity/v2FS2Y8T">route capacity</a> of a <a href="/facts/Rapid_transit/bbhkQbAW">rapid transit</a> or <a href="/facts/Public_transport/DXhqazz5">public transport</a> system. </p>