Self-adaptation traffic signal control method for four-way roundabout
A roundabout and traffic signal technology, applied in the field of adaptive traffic signal control, can solve the problems of unable to automatically detect the flow of left-turn motor vehicles and difficult to generate signal control schemes
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specific Embodiment approach 1
[0058] Specific embodiment one: a kind of four-way roundabout self-adaptive traffic signal control method of the present embodiment, it realizes according to the following steps:
[0059] Step 1: Layout the loop coil detector at the four-way roundabout;
[0060] Step 2: Set the phase sequence of the four-way roundabout;
[0061] Step 3: Set up the four-way roundabout adaptive traffic signal control process;
[0062] Step 3.1 Set the minimum green light time, maximum green light time and yellow light time of phase i:
[0063] Phase i, i=1,2, minimum green light time g imin , unit: s, calculated according to formula (1):
[0064] g imin =7+max(L i / 1.2)-I i (1)
[0065] Among them: L i — the intersecting road width of the road where the phase i controls the traffic flow, m;
[0066] I i —The time of running yellow light after the green light of phase i ends, that is, the interval time between green lights, s;
[0067] I i The recommended value is 3 seconds.
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specific Embodiment approach 2
[0104] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the step 1 is specifically:
[0105] A typical four-way roundabout includes four entrances and four exits. Induction coil detectors are arranged at each entrance and internal lane of the four-way roundabout. The length and width of the detector are both 2.0m. The center lines of the lanes coincide; at the entrance of the four-way roundabout, it is arranged at the position 3.0m behind the stop line of the lane; inside the four-way roundabout, it is arranged at the intersection of the extension line of the intersecting road centerline and the inner lane of the intersection ;
[0106] Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0107] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: figure 1 Take the roundabout shown as an example, its phase sequence is as follows figure 2 As shown, the two phases display green lights in turn, and the step 2 is specifically:
[0108] Two phases are set at the four-way roundabout, and the two phases display green lights in turn; each phase controls two traffic flows, the traffic flows at the south and north entrances are controlled by phase one signal lights, and the traffic flows at the east and west entrances are controlled by phase one. Two signal light control. This setting method allows the two traffic streams with far entrances to pass at the same time, which can reduce the interweaving of motor vehicles in the ring and improve the traffic capacity.
[0109] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.
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