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北京6次单双号限行情况分析:道路拥堵指数降一半

2016-01-11 12:49:13   

原标题:单双号限行助路畅天蓝

本报记者刘冕

在北京交通发展研究中心的大会议室里,一整面墙壁上贴着从2010年1月至2015年6月本市每天晚高峰交通拥堵分布图,除了交通指数,还分别用深绿、浅绿、黄、橙、红五色,依次标注畅通、基本畅通、轻度拥堵、中度拥堵和严重拥堵。从图上看,凡入9月,红色、橙色几乎成为主色调,下半年惟一一长串儿绿色是2014年11月3日至14日,当时恰逢APEC期间,实行机动车单双号限行,本市也难得冬季天天见蓝天。

单双号限行有助于增“绿”添“蓝”。交通研究数据显示:在这期间,全市交通拥堵明显缓解,主要道路运行效率提升;而环保部门也表示,限行大幅降低机动车排放的污染物总量,有利于大气质量的改善。

限行期间环路车速增四成

2007年至今,本市共实施6次单双号限行措施,分别是2007年好运北京测试赛、2008年奥运会、2014年APEC会议期间、2015年的田径世锦赛和广场阅兵以及2015年12月的2次空气重污染红色预警期间。

昨日,北京交通发展研究中心发布2014年、2015年4次单双号限行期间交通数据:全路网工作日早晚高峰平均交通指数在3.0左右,处于基本畅通状态。而单双号限行前后工作日的早晚高峰,平均交通指数在6.0以上,处于中度拥堵以上状态,交通指数偶尔还会破8。

“单双号限行期间全天的交通指数降幅在50%左右。”该中心副主任温慧敏给出一组数据——单双号限行期间,全天各时段路网交通指数主要在2至3之间,峰值在4.0左右。如果在交通指数图上看,全天都是绿色的。

把数据翻译过来:单双号期间,各环路早晚高峰行驶速度提高40%以上,往常严重拥堵的局部路段均有明显好转。比如,二环路早晚高峰平均速度达到35公里/小时以上,长安街、前三门大街等主要道路早晚高峰也提速30%左右。

不过即使单双号,二三环依旧达到拥堵等级。其中,二环内早晚高峰平均交通指数接近6.0,即中度拥堵,市民一次出行平均仍需要比畅通时至少多花费八成的时间。三环内早晚高峰略好,平均交通指数在5左右,属于轻度拥堵状态。

北京交通发展研究中心主任郭继孚解释:“因为限行期间路上比以前好走了,司机肯定愿意走近道,原本绕行三环四环的车就会往二环聚集。这是交通行为的一种动态选择。”

污染物浓度比值降两成

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