l**4
发帖数: 853 | 1 希望对大家有所帮助吧。我当年就是这样学习美国的highway的。
标 题: Re: 诚心请教：我始终不敢一个人独立上高速怎么办啊？
发信站: BBS 未名空间站 (Sat Jun 11 14:45:51 2011, 美东)
hw 183 奇数 南北方向
hw 282 偶数 东西方向
同时HW上有牌子指示你现在那个方向。
reference：
http://en.wikipedia.org/wiki/United_States_Numbered_Highways
Numbering
The two-digit U.S. Routes follow a simple grid, in which odd-numbered routes
run generally north to south and even-numbered routes run generally east to
west. (U.S. Route 101 is considered a two-digit route, its first "digit"
being 10.) The numbering pattern for U.S. Routes is the reverse of that for
the Interstate Highway numbers—U.S. Routes proceed from low even numbers in
the north to high even numbers in the south, and from low odd numbers in
the east to high odd numbers in the west. Numbers ending in 0 or 1 (and U.S.
Route 2[3]), and to a lesser extent in 5, were considered main routes in
the early numbering, but extensions and truncations have made this
distinction largely meaningless. For example, U.S. Route 6 was until 1964
the longest route (that distinction now belongs to U.S. Route 20). The
Interstate Highway System's numbering grid, which has numbers increasing
from west-to-east and south-to-north, is intentionally opposite from the U.S
. grid, to keep identically numbered routes apart and to keep them from
being confused with one another | w*******8
发帖数: 865 | 2 可是我都是在local变成路痴，没有方向感的...... | l**4
发帖数: 853 | 3 LOCAL的话，记住主要干线就好了吧。如果不是chicago大城市的话。 |
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