某主干道路線的平面設計案例綜述1.1設計原則（1）線性設計應直達、連貫并于周邊環境、地形盡量保持協調；（2）保障行車駕駛的舒適安全，將平、縱、橫綜合分析，令道路自然引導視線且使視線連續，盡量防止或減少不利的線性組合；（3）設計時應與縱斷面線性設計相結合，在平原地帶應避免采用太長直線線性，造成視覺疲勞，誘發事故；（4）平曲線應符合長度要求，若長度過短，駕駛員的操作和反應時間則較少，在高速行駛時易引發交通事故；1.2設計指標與標準（1）直線：平曲線之間直線段的長度，應符合路線設計規范的規定；（2）圓曲線最小半徑及平曲線與圓曲線的最小半徑均應符合規范表6.2.2和6.2.3的要求[8]；（3）停車視距不應小于規范中表6.2.7[8]的要求：1.3平曲線計算平曲線計算圖示如圖3-1所示。圖3-1緩和曲線計算圖示q=p=βT=L=E=J=2T?L(m)3.3逐樁坐標表表3-5逐樁坐標表樁號坐標（米）方位角xyK0+04169264.759589088.39527.090°+204169282.565589097.50327.090°+23.614169285.779589099.14727.090°+404169300.092589107.13229.160°+61.4084169318.786589117.56329.160°+804169334.739589127.11230.903°+1004169351.9589137.38430.903°+103.5424169354.939589139.20332.338°+1204169368.84558948.00632.338°+138.5394169384.554589157.95232.755°+1604169402.557589169.53432.755°+180.0574169420.266589180.92733.372°+2004169436.085589191.34733.372°+2204169452.788589202.34933.372°+2404169469.49589213.3533.372°+2604169486.192589224.35233.372°+2804169502.895589235.35333.372°+295.6144169515.934589243.94233.372°+3004169519.605589246.34233.178°+3204169536.345589257.28733.178°+341.2424169554.124589268.91133.510°+3604169569.764589279.26733.510°+3804169586.44589296.56733.510°+391.3364169535.892589296.56733.510°+4004169603.118589301.34733.486°+4204169619.798589312.38233.486°+4404169636.478589323.41733.486°+4604169653.159589334.45133.486°+467.5634169659.466589338.62433.486°+4804169663.885589345.41633.101°+5004169686.639589356.33833.101°+5204169703.394589367.26133.101°+5404169720.148589378.18333.101°+546.714169725.769589381.84733.533°+5604169736.847589389.18933.533°+5804169753.518589400.23733.533°+6004169770.19589411.28633.533°+6204169786.861589422.33433.533°+6404169803.533589433.38233.533°+6604169820.204589444.43133.533°+6804169836.875589455.47933.533°+7004169853.547589466.52733.533°+7204169870.218589477.57633.533°+733.3274169881.327589484.93833.533°+7404169886.903589488.60333.314°+7604169903.617589499.58733.314°+7804169920.33589521.57233.314°+8004169937.044589521.55633.314°+8204169953.757589532.5433.314°+8404169970.471589543.52533.314°+8604169987.1845895543.52533.314°+8804170003.898589565.49433.314°+886.5924170009.407589569.11433.314°+9004170020.582589576.52333.541°+9204170037.252589527.57333.541°+9404170053.922589598.62433.541°+9604170070.591589609.67533.541°+9804170087.261589620.72633.541°+997.2484170101.637589630.25633.541°K1+204170120.63589642.78233.406°+404170137.326589653.79433.406°+604170154.022589664.80533.406°+804170170.718589686.81633.406°+1004170187.414589686.82733.406°+1204170204.11589697.83833.406°+1404170220.806589708.8533.406°+1604170237.502589719.86133.406°+1804170254.198589730.87233.406°+2004170270.893589741.88333.406°+2204170287.589589752.89533.406°+2404170304.285589763.90633.406°+2604170320.981589774.91733.406°+2804170337.677589785.92833.406°+284.2944170341.262589788.29333.406°+3004170354.379589796.9333.363°+3204170371.083589807.92933.363°+3404170387.787589818.92833.363°+3604170404.491589829.92733.363°+3804170421.195589840.92633.363°+4004170437.899589851.92433.363°+4204170454.603589862.92333.363°+4404170471.307589873.92233.363°+450.1644170479.79658987951233.410°+4604170488.007589884.92833.410°+4804170504.702589895.9433.410°+5004170521.397589906.95333.410°+5204170538.092589917.96533.410°+5404170554.787589928.97733.410°+5604170571.483589939.9933.410°+5804170588.178589951.00233.410°+6004170595.463589955.80833.410°+6204170621.568589973.02733.410°+6404170638.263589984.0433.410°+6604170654.958589995.05233.410°+6804170671.653590006.06433.410°+7004170688.348590017.07733.410°+7204170705.043590028.08933.410°+7404170721.739590039.10233.410°+7604170738.434590050.11433.410°+7804170755.129590061.12733.410°+8004170771.824590072.13933.410°+818.1934170787.011590082.15633.345°+8404170805.228590094.14333.345°+8604170821.935590105.13733.345°+8804170838.643590116.1333.345°+9004170855.35590127.12433.345°+9204170872.058590138.11733.345°+9404170888.765590149.11133.345°+9604170905.473590160.10533.345°+9804170922.18590171.09833.345°K2+04170938.888590182.09233.345°+204170955.595590193.08533.345°+404170972.303590204.07933.345°+61.3754170990.159590215.82833.345°3.4交叉口設計3.4.1設計原則（1）改造道路交叉口應以道路紅線為依據，根據設計車速、交通量、道路類別并結合未來發展，進行設計；（2）設計要使過路車輛用盡可能少的時間通過路口，避免交叉口擁堵；（3）緣石半徑應符合規范[8]要求；3.4.2交叉口轉角半徑R1確定RRV取30km/h（取設計速度的0.5-0.7倍），μ取0.17，ih取值0.02[15]則：RR故，本設計中R1取33m。3.4.3交叉口立面設計交叉口特征點簡圖見圖3-2。圖3-2交叉口特征點簡圖交叉口豎向設計的計算過程如下所示：?AF???AB由上述公式求