【正文】 00 bicycles each peak hour and the acreage in most arterial intersectionsis above 2500 m178。. Though the modious intersection space resources acmodate theinterchanging demand between pedestrians and bicycles or motors, the lack of reasonable trafficchannelization, the low utility of space resources,and the serious conflict greatly restrict the intersection capacity(). Temporal and spatial separation of motor and nonmotorized traffic Temporal and spatial separation of motor and nonmotorAccording to the modious space resources and the serious traffic conflict,temporal and spatial separation of motor and nonmotor should be conducted atintersections to classify the road rights of pedestrians, bicycles and motors in timeand space. With regard to the spatial road rights the motors, pedestrians and bicyclesshould be restricted to travel in different areas and bicycles travel anticlockwisewhile the pedestrians get a bidirectional crossing (). Placement of Entry and Exit lanesThe number of entry lanes should more than the exit. Methods that can beadopted to add entry lanes include offsetting median pavement marking, enlargingthe entry approaches or removing the median closure while considering matching thenumber of entry lanes with road capacity. The suggested proportion of the number ofentry lanes to that of lanes on road in signal direction is 1:1~2:1 (). methods to add entry lanesTable 2 Relationship between lanes on road (one way) and entry lanes at intersectionRoadways of road ??one way??12345corresponding intersection entrance roadways??≥2≥2≥3≥4≥5 Traffic Island Design1)the location of traffic islandThe location of traffic island should reasonably guide motor and nonmotortraffic flow, reduce the severity of conflict, ensure security and enhance the location of island is related to the placement of advanced rightturn lane. Whenthe angle of two crossing roads is less than 75176。and there is enough space resourcesfor pedestrian refuge, advanced rightturn lane should be adopted, or else not(,).Fig3 Location of traffic island Fig4 location of traffic island(without advanced rightturn lane) (with advanced rightturn lane) Parameters related to the location of islandDesign speed??km/h??Bicycle lanewidth at cornerD1??m??SafeoffsettingwidthD2??m??inward offsettingwidthD3??m??Bicycle lanewidth onroadwayD4??m??Vehicle lane width atcornerD5??m??40D1≥D4R’－/2 R’－ L’/2≥(L178。/R＋ /)2＋??≤40D1≥D4R’－/2 R’－ L’/2≥(L178。/R＋ /)2＋??footnote:R’—the minimal turning radii L’—vehicle widthR—turning radii of advanced right turn laneL—vehicle length2) The refuge area of traffic islandThe refuge area of traffic island should be no less than . Pavementmarkings can be adopted while the area is too limited. The area on safety islandshould be large enough to acmodate the minimal need of pedestrians and thebicyclists waiting in red time. Model lists as follow:A=(QpTpAp+QbTbAb)SaSl/3600 (1)In the equation:A—The refuge area of traffic island (m178。)。Qp，Qb—the arrival rate of pedestrians and bicyclists (person/hour,bicycles/hour)。Tp，Tb—the maximal red time that the pedestrian and bicyclist have waited for(second)。Ap，Ab—the static refuge areafor one person and onebicyclist. They are m178。 and m178。Sa—safety coefficient 。Sl—the coefficient of servicelevel,—congestion,1—relative congestion ,2—general,3—relative fort,5—fort.3）traffic island designThe contour of traffic island is the bination of beeline and circular refuge area should be set inside traffic island for crossing pedestrians andbicyclists. The end of traffic island should be observable and smooth enough to directvehicles. Considering the demand on fort and convenience for pedestrian and bicyclist entrancing and exiting traffic island：the refuge area should higher 35cmthan the ground, with a 1:10 conjunctive grade. Blind way should be set on therefuge area and connected with pavement (, ). Traffic island design Traffic island traffic channelization designlongitudinalwidthL1(m)??Transversewidth L2(m)??EntryWidthL3(m)??Centrallandscapeisland(m)??Entrylandscapeisland(m)??Exitlandscapeisland(m)??grade oftraffic islandR11R12R21R22R31R32HRMax[10,Q1/4+5 ]Max[10,Q2/4+5 ]8812123~5cm1:10Footnote:Q1,Q2—the maximal longitudinal and transverse bicycles waiting during a cycle at peak hour4) Landscape design of traffic islandThe triangular area on traffic island can be utilized to design urban greening andlandscape, and the background and pattern design of refuge area can be connectedwith the local historical culture.4 Traffic Channelization Design of the Yu Daiqiao Roundabout Flyover Traffic Channelization DesignThe Yu Daiqiao intersection is located in the LuoMashi CBD of reconstruction the roundabout model restricted the capacity, travelingconditions under flyover is bad and the conflict between bicyclists and pedestrians isserious. The oneway traffic control in western and northern entry approachesreduces the accessibility of the road and results in excess concentration of traffic level of service of the intersection is difficult to acmodate the demand onsafety, efficiency, convenience and environmentalism. Based on the traffic demandcharacteristic, the channeling measures mainly include ():Table 5The Yu Daiqiao intersection traffic channelization designContrastkey points of traffic channelization?? Remove the roundabout flyover for grade crossing.?? Optimize lanes of entry and exit.?? Set traffic island to guarantee the safe and convenientcrossing of pedestrians and bicyclists.?? Set greening islands at the ends of traffic island toensure the safety of pedestrians and the bicyclists as wellas beautifying urban environment.?? Divide traveling area for pedestrians and the bicyclists.?? Conduct bar