The number of vehicles and passengers travelling on the Skidegate-Prince Rupert ferry took an abrupt plunge in April, after many months of steady increases.Vehicle traffic was down by 8 percent in April 2014 compared to the previous April, while passenger numbers dropped almost 10 percent - the biggest plunge recorded in the BC Ferry system during the past month. Most routes saw increased traffic in April, ahead of the significant service reductions that took effect April 28.The number of vehicles travelling across Hecate Strait on the Northern Adventure during the past month was 899, compared to 981 in April 2013, while the number of passengers was 1,907, down from 2,102.The Kwuna route between Graham and Moresby Islands also experienced a decline, with vehicle traffic dropping 3 percent and passengers down 4 percent.The exact number of vehicles making the short trip between Skidegate and Alliford Bay was 3,364 this April, compared to 3,466 the previous April. The passenger count was 6,516, down from 6,784.