請問高速公路的英譯?

請問大家如果是北宜高速公路翻成英文的話該怎麼說呢?謝謝~
看看官方和媒體說法

要用哪一個由看倌門去評斷吧!官方說法 Government Information Office網頁上講到交通建設.文中提到北宜高速公路The Taipei-Yilan Freeway 北宜高速公路

which has been under construction since July 1992

will connect the Second Freeway in eastern Taipei with northern Yilan County.(*See original article:http://www.gio.gov.tw/taiwan-website/5-gp/yearbook/P213.htm)交通部台灣區國道高速公路局也是用The Taipei-Yilan Freeway (*See original article: http://www.freeway.gov.tw/en_05_04.asp)媒體說法 Taipei Times新聞中提到Yu's inspection tour focused on the construction of the 12.9km Hsuehshan Tunnel (雪山燧道) -- the centerpiece of the 31km Beiyi Freeway (北宜高速公路)

which

when it opens in 2005

will reduce the journey between Taipei and Ilan from two hours to just 40 minutes.(*See original article: http://www.taipeitimes.com/News/taiwan/archives/2002/03/04/126253/print) 參考資料 What I Found
高速公路在台灣可以叫high way 或 Free way北宜高就叫 Pei I High Way (Free Way)
高速公路英語叫railway北宜是專有名詞你上網找羅馬拼音對照表就行了
railway?第一次聽說ㄋㄟ！

Railway是鐵路吧
Highway and freeway are each one word themselves. Don't separate