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JJitney随停公车；简便公车JobMixFormula工地拌合公式JointOpening开口宽度；JointOperationofTransport联运JointedConcretePavementJCP接缝式混凝土铺面JointedReinforcedConcretePavementJRCP接缝式钢筋混凝土铺面Joule焦耳（能量单位）JournalResistance轴颈阻力Jumbo钻堡Junction路口Junctionbox汇流井KKalmanfilteralgorithm卡门滤波法Kalmanfilter,Kalmanfiltering卡门滤波Keeprightsign靠右标志Keycountstation关键调查站KinematicViscosity动黏度Kink纽结Kiss-and-Ride停车转乘KneadingAction辗挤作用Knot节（等于每小时1.85公里）KnowledgeBase知识库Kurtosis峰度LLag间距Lagtime延迟时间LandAccess可及性LandExpropriation土地征收LandTransportation陆路运输Landuse土地使用；土地利用Landfillsite掩埋场Landscapedesign景观设计Landslide/Slump坍方Lane,trafficlane车道Lane巷道Laneallocation,Lanelayout车道配置LaneBalance车道平衡Lanechange变换车道Lanecontrol车道管制Lanedistribution车道分布LaneGroup车道群Laneheadway车道行进间距LaneLine车道线LaneReductionTransitionLine路宽渐变线Laneresidualwidth巷道剩余宽度LaneWidth车道宽度Lane-directioncontrolsignal车道行车方向管制号志LargeNetworkGrouping大型网络群组划分LargePassengerVehicle大客车Large-areaDetector大区域侦测器Latenttraveldemand潜在旅次需求LateralAcceleration横向加速率Lateralclearance侧向净距LateralCollisionAvoidance侧向防撞LateralSeparation左右隔离Lateralshift侧向位移Lawsofrandomness随机定理Lay-DownVehicleDays停驶延日车数Leading绿灯早开Leading&laggingdesign早开迟闭设计LeadingCar领导车Leadingdesign早开设计LearningPermit学习驾照Lease租赁Leftturn左转Leftturnaccel-decel&storagelaneisland左转加减速－停储车道式分向岛Leftturnaccelerationlaneisland左转加速车道式分向岛Leftturncrossing左转交叉穿越Leftturnlane左转车道Leftturnmaneuver左转运行Leftturnonred在红灯时段内进行左转运行Leftturnwaitingzone左转待转区Leftturningvehicle左转车辆Leg路肢Legibility公认性；易读性Length长度LengthofEconomicalHaul经济运距Lengthofgrade坡长Lengthoflanechangeoperation变换车道作业的长度LengthofSuperelevationRunoff超高渐变长度Lengthoftimeparked停车时间的久暂Level水准仪；横坑；水平面LevelCrossing平面交叉Levelofillumination明亮度水准LevelofService服务水准Levelorflatterrain平原区Levelsurface水准面LevelingCourse整平层LicensePlate汔车号牌LicensePlateMethod牌照法LicenseSuspension吊扣驾照LicenseTermination吊销LicensePlate汽车号牌Licenseplatemethod车辆牌照记录法；车辆牌照法LicensePlateRecognition车牌辨识Licenserenewalmethod换照法LifecycleassessmentsLCA生命周期评估Lift-On／Lift-Off吊上吊下式LightCharacteristics灯质LightList灯质表LightMotorcycle轻型机踏车Lightonmethod亮灯法LightPhase灯相LightRailRapidTransitLRRT轻轨捷运LightRailTransitLRT轻轨运输LightTruck小货车LightingSystem灯光系统Limitedpurpose(parking)survey局部目的（停车）调查LineCapacity路线容量Linemarking标线LinearReferencingSystem线性参考系统LinearShrinkage线收缩Linear-InductionMotorLIM线性感应马达Linear-SynchronousMotorLSM线性同步马达Linkarrivalrate路段流量到达率Linkflow路段流量Linkperformancefunction道路绩效函数Linkedorcoordinatedsignalsystem连锁号志系统LipCurb边石Liquidate变成液体：偿还：破产LiquidatedDamage违约罚金LoadEquivalentFactorLEF荷重当量系数；载重当量因素LoadFactor负荷指数Loadlimit载重限制LoadSafetyFactor载重安全因素Loading载重Loading&unloading装卸Loading&unloadingzone上下旅客区段或装卸货物区段LoadingIsland旅客上下车的车站岛LocalAreaNetworkLAN局域网络LocalController路口控制器Localstreet地区性街道Localtraffic地区性交通Localtransmissionnetwork区域传输网络Localizer左右定位台Locationfile地点档案Locationofstop站台设置位置LockedJoint连锁接头LogLikelihoodFunction对数概似函数LogicalArchitecture逻辑架构LogitModel罗吉特模式Logo标记；商标LongLoop长线圈Longtunnel长隧道Longtunnelsystem长隧道系统Longvehicletunnel车行长隧道Long-chord长弦Longitude经度LongitudinalCollisionAvoidance纵向防撞Longitudinaldistributionofvehicle车辆的纵向分布LongitudinalDrain纵向排水LongitudinalGrade纵坡度LongitudinalJoint纵向接缝LongitudinalSeparation前后隔离LongitudinalSlopeForGradeLine纵断坡度Longitudinalventilation纵流式通风LongitudinalWarping纵向扭曲Long-RangePlanning长程规划Long-termscourdepth长期冲刷深度Loop环道（公路方面）；回路（电路方面）LoopDetector环路型侦测器Loopinductance感应回路LosAngelesAbrasionTest洛杉矶磨耗试验LostTime损失时间LouversofDaylightScreeningStructure遮阳隔板Lowbeam近灯LowHeat低热Loworfirstgear低速檔LowPressureSodiumLamp低压钠气灯Lowrelativespeed低相对速率LowTruss低架式Lumen流明Luminance辉度Luminaire灯具LuminousEfficiencyofaSource光源效应Luminousflux光流；光束LuminousIntensity光度；光强度Lux勒克斯MMacroormassanalysis汇总分析；宏观分析Macroscopic巨观Magneticdetector电磁（磁性）侦测器MagneticLevitationMaglev磁浮运输系统Magneticloopdetector磁圈侦测器Magnitude规模Mainline主线MaintenanceFactor维护系数MaintenanceWork养护工程Majorflow主要车流Majorparkingsurvey主要停车调查MajorPhase主要时相ManagementInformationBaseMIB网管信息库（管理讯息库）ManagementInformationSystemMIS管理信息系统Maneuverability运行性Manhole人孔；井Man-machinedrivingbehavior人机驾驶行为Man-machineinteraction人机互动Manualcounts人工调查法MapMatchingMethod地图配对法Mapscale图比例尺Marginalvehicle边际车辆Marker标物；标记MarketPackage产品组合MarketSegment市场区隔Marking标线MarshalingYard货柜汇集场MarshallTest马歇尔试验MassDiagram土积图Masstransportation大众运输MatchFund配合款Master主路口Mastercontroller主要（总枢纽）控制器MasterNode主控制点MasterPlan主计画Materialhandling物料搬运Maturity成熟程度Maxout绿灯时间完全使用之现象Maximumallowablegradient最大容许坡度MaximumAllowableSideFrictionFactor最大容许侧向摩擦系数MaximumArterialFlowMethod最大干道流量法Maximumcapacity最大容量MaximumDensity最大密度Maximumflowrate最大流率MaximumGrade最大坡度Maximumindividualdelay最大个别延滞MaximumLikelihoodFunction最大概似法MaximumLoadSectionMLS最大承载区间MaximumPeakHourVolume最尖峰小时交通量Maximumpossiblerateofflow最大可能车流率Maximumqueue最大等待量（车队长度）MaximumTheoreticalSpecificGravity最大理论比重MeanAbsoluteValueofErrorMAE平均绝对误差Meandeviation平均差Meandifference均互差MeanSquareErrorMSE平均平方误差Meanvariance离均差Meanvelocity平均速度MeasureofEffectivenessMOE绩效评估指针MechanicLicense技工执照Mechanicalcounter机械式计数器Mechanicalgarage机械式停车楼（间）MechanicalKneadingCompactor揉搓夸压机MechanicalLoad-TransferDevices机械传重设备Mechanicalparking机械停车Mechanicalpower机械动力Median中央分隔带；中央岛Median(5