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1、General control of cross-ring4.3.1 passage space design1. Import Road Layout The pure of the implementation of signal control is to enable different traffic flows, the separation in time. In order to facilitate the implementation of signal control, it is necessary to import Road lane divided function (see Figure 4), enables the flow of traffic各行其道to oid mutual interference.Different flows in order to oid causing traffic chaos intertwined, Central Road improve traffic capacity, as well as with the import function to match the Road driveway, it is necessary to Ring Road also divided roadway function, is mainly divided into lanes to turn left and go straight ahead (see Figure 4). Ring Road that is at least has a straight, a left turn lane.4.3.2 Determination of signal phaseBecause of the role of Bay Road, the traffic to turn left and straight on to the conflict between traffic can actually evolve into a degree of interwoven, the result of the implementation of four-way ring to pay the general control, to be used in the form of two-phase control; more Road Central, submitted by the specific circumstances of the case to determine visibility.4.3.3 signal configuration and priority rules1. Signal configuration based on the above a参考文献：nalysis, the arrow lights should be configured in order to facilitate the flow of different traffic with different traffic signal.2. Priority rule ring along with the phase because of the existence of different traffic flows, the left turn traffic flow and traffic flow straight to the potential for conflict exists between, it was necessary to set the priority rules, usually in the same phase, the straight traffic stream he precedence in the left turn traffic flow (also visible on the actual situation).4.3.4 Signal TimingRing Road divided roadway function and implementation of signal control can be used to eliminate cross-Ring Road in the loop-cutting issues, thus the control mod in the signal control principle with the general ll-crossing control mod is similar to Webster-based allocation mod to determine when the timing program, and depending on the actual coordinate the flow of traffic than the actual green time. Howr, due to the Central Road, vehicles treling the speed limit and driving distance is longer, according to the pract of using yellow light time of 3s may lead to the end of yellow line to turn left through the parking of vehicles with another phase of the early exit of vehicles (cars to turn left or go straight vehicles) in the Bay Road entrance of intertwined or conflicts, which he a need to re-determine the time between green and yellow light duration.Located around the island radius r0, Ring Road, the width of each lane w, calculated treling speed v0, the driver reaction time t0, then import Road vehicles from passing through the most lateQQ 视频啊ral straight junctions adjacent most lateral point of conflict is about the shortest distance(17)So (two-phase case) the Green interval I for(18)By type (13) yellow light time can be identified.1. Flow conditions are usually, non-signal-controlled roundabout capacity value of the experience of 2 000pcu / h or so, so when the actual traffic demand roundabout approach or exceed the value of this experience that it is necessary to the implementation of signal control is proed in this The three kinds of control mode, both for flows exceeded 2 000pcu / h and the control signals required to pay in terms of ring. The first two kinds of control mod is more applicable to a larger left turn traffic situation.。

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