At the start of the event, city traffic police detachment of engineers police Li Feng bin first is the white light of the road of harmonious optimization project do understand said. As xi 'an taibai road north and south direction of main road, congestion often attack. In order to make more intuitive comparison before and after optimization, the police after driving video site demonstrates the structure of the sections before and after optimization. "On the road before the lights to optimize, February 22 at 4 PM, police driving experience, a total of 16 minutes and 35 seconds; optimized, on March 1, at 4 PM, police driving takes eight minutes and 44 seconds." Li Feng bin said. Have so big difference, because the road traffic around the clock, optimization, vehicle after a crossroads and superposition of waiting vehicles at the next crossing backlog, some intersection signal cycle is long, and along the traffic law practice, etc., whole journey more congestion.

After listen to the explanation of the police, the citizens also put forward their question about the lights and transportation and mindset. Citizens Zhang Feng first ask: "travel found some sections in the process of light have the countdown, but not some sections, why is this?" , Li Feng Lin replied: "lights countdown and waste until now still without a word, the advantage of the countdown is to give the drivers see clearly time, improve the initial speed of the vehicle. But together, also caused many to rob the practice of green light, so will produce a lot of potential safety hazard.

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