Following the opening of National Highway No. 3 (the Second Northern Freeway) at the beginning of the year, an important milestone was reached in a second major transportation project-the Taipei-Ilan Expressway-when drilling of one of the main tunnels of the Hsuehshan Tunnel, the most challenging part of the project, was finally completed on March 14.
繼國道三號（第二高速公路）在今年初通車後，國內另一項重大交通工程──北宜高速公路中最艱鉅的「雪山隧道」亦於三月十四日貫通。