先週末に，やっとのことで圏央道が成田方面につながりました（神崎〜大栄間開通）．一昨年度開通と聞いていたのですが，伸びに伸びてようやく6月7日に開通しました．<\/p>\n
この圏央道の予想される利用は，年に数回，家族や自分の成田空港への送迎・往来です．これまで，開通前の下道では，深夜に最短50分という記録はありますが，たいていは1時間15分〜1時間30分くらいかかっていました．たぶん，45分くらいで着くんじゃないでしょうか．<\/p>\n
ところで，首都高三郷線の朝の上りは，小菅ジャンクションという，設計上の欠陥があるので，いつも混雑しています．2006年に東京に勤務していた頃，ときどき高速バスを利用したので，この渋滞には関心があって，今でもときどき日本道路交通情報センターのサイトを見てます．<\/p>\n
最近は，朝の三郷線上りの渋滞は限界と思われるほどでした．2006年当時は，渋滞のはじまりは，八潮南から八潮の間でした．それが，最近は普通八潮より手前で，外環より手前からということもしばしばでした．<\/p>\n
それが，圏央道の開通で，八潮南くらいまで緩和されました．午前10時頃には渋滞が解消しています．<\/p>\n
専門家の話とかで，渋滞は交通量が何パーセントか増加するだけで起こる（何パーセントか減るだけで解消する）という話なので，茨城方面から圏央道を通って千葉方面に抜けられることで，三郷線の交通量がほんの少し減っただけで，渋滞がずいぶん緩和したのだと思います．<\/p>\n
となると，外環の三郷〜市川（船橋?）が開通すれば，渋滞は完全になくなると予想されます1<\/a><\/sup>本線部の用地は100%取得済みだそうです → 事業の進捗状況<\/a><\/span>．<\/p>\n もっとも，三郷線の渋滞が緩和したことを皆が知って，また三郷線を利用する車がほんの数パーセント増えたら元の木阿弥ですが．<\/p>\n","protected":false},"excerpt":{"rendered":" \u5148\u9031\u672b\u306b\uff0c\u3084\u3063\u3068\u306e\u3053\u3068\u3067\u570f\u592e\u9053\u304c\u6210\u7530\u65b9\u9762\u306b\u3064\u306a\u304c\u308a\u307e\u3057\u305f\uff08\u795e\u5d0e\u301c\u5927\u6804\u9593\u958b\u901a\uff09\uff0e\u4e00\u6628\u5e74\u5ea6\u958b\u901a\u3068\u805e\u3044\u3066\u3044\u305f\u306e\u3067\u3059\u304c\uff0c\u4f38\u3073\u306b\u4f38\u3073\u3066\u3088\u3046\u3084\u304f6\u67087\u65e5\u306b\u958b\u901a\u3057\u307e\u3057\u305f\uff0e 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