公路等级四级公路
设计速度(km/h)
806040302060车道数22222或1646448
64
8646
4车道宽度(m) 3.75 3.5 3.5 3.53
3.5一般值12108.57.5 6.5或
4.533.5263224.5
234234.5284133.5263224.5最小值
108.5----23.5-21.52040-2538.5
-23.5
-21.5停车视距(m)1107540302075
一般值550350200150100最小值35025015010070一般值4002001006530200最小值250125603015125路拱≤2%250015006003501501500路拱＞2%335019008004502001900复合曲线临界圆曲线半径R(m)
R1，R2900500250130130500回旋曲线最小长度(m)
705035252050一般值
400300200150100300最小值140100705040100路线转角△≤7°1000/△
700/△500/△350/△280/△700/△最大纵坡(%)567896最小纵坡(%)0.30.30.30.30.30.3最小坡长(m)20015012010060150最大合成坡度(%)9
9.510101010.5一般值450020007004002002000极限值300014004502501001400一般值300015007004002001500极限值200010004502501001000一般值170120906050120最小值705035252050一般值 1.50.75最小值0.750.25一般值0.750.50.25双道0.5最小值
0.5
0.5
0.5单道
0.5
803.75
110 3.75
凹形竖曲线最小半径R(m)
竖曲线长度(m)平曲线最小长度
二级公路凸形竖曲线最小半径R(m)100500170三级公路路基宽度(m)不设超高圆曲线最小半径R(m)圆曲线最小半径R(m)超车视距(m)700400400052501500850.3851104002502500101000021045001200/△40.32506500-9007020010.54500300070-4000.75
0.5
-一级公路
300020001401000/△5 2.5右侧硬路肩宽度土路肩宽度
高速公路
1201003.75 3.75210
160
40003
0.750.75
0.750.75
2.5
3350170300060050010007006504005500340.30.3750052502100150010085101030001700010000110006500900704002503002502001701400/△
1200/△0.750.75 2.51.50.7580
3或3.5332.50.75
0.75
3.525021010085110
45004001401000/△525000.320010.5335070①△＜2°时，按△＝2°计算;② V≥80时R1：R2＜1.5；V＜80时R1：R2＜2
3000300020001700.75
600045004000