the outer swept paths of larger vehicles are used to
determine the approximate location of the yield lines.
Now draw the paths of light vehicles turning right (left
on RHD roads). If possible try to form two lanes well
before entry such that the vehicle in lane 2 is driving
parallel to the nearside kerbline at the yield line. You
need to create a clear deltoid shape in the centre with
convex curves around which all three movements circulate
|| The deltoid determines the location of the
central island. You can adjust the paths which should
represent similar degrees of steering effort for each of
the three movements. All must involve a radius which
falls to or below around 60m radius at some point on
approach or in the junction.
for UK designers: Former TD16/93 required deflection to be
provided on the approaches where possible. On
mini-roundabouts this is nearly impossible, but the
deflection must be provided somewhere on
all crossing paths unless physical vertical deflection is
provided to a sufficient standard.