Turning template paths should provide 2.5 foot clearance to the face of curbs - [Reference: MnDOT Road Design Manual (RDM) 5-2.04.02]. For Roundabouts - Turning template paths should provide a minimum of 1 foot and preferably 2 feet to the face of curbs. Use guidance from NCHRP Report 672, section 6.4.3 when laying out vehicle paths.
Provide 6 foot bike cutouts along roadway for bikes to access the trail adjacent to the roundabout. Refer to NCHRP Report 672, section 220.127.116.11, for guidance.
Turn paths for the double left turns should be laid out using a WB-62 in the outside lane and a 14 foot strip alongside on the inside of the turn for a passenger vehicle - [Reference: MnDOT Road Design Manual (RDM) 5-3.01.06].
Throat widths for double left turns should desirably be 36 feet, with a minimum of 30 feet - (Reference: RDM 5-3.01.06).
On freeway projects, exit ramps – Has the 10 second decision sight distance been checked? Reference RDM 2-5.08.04: Height of eye = 3.5 feet, height of object = 0 feet which is the beginning of the striped gore area.
Diamond interchanges, cross street over mainline, at the exit ramp/cross street intersection – Intersection Sight Distances:
Through/Stop Control – Compute the left turn from stop and right turn from stop distances. Check these distances against the profile of the cross street.
Signal Control - Compute the right turn from stop distance, for right turn on red. Check this distance against the profile of the cross street.
Compute Stopping Sight Distance for barriers between vehicles and pedestrians.
Use Standard Plate 7109 at the first introduction of a raised median nose when going from an undivided roadway to a divided roadway. Use Standard Plate 7113 at the beginning of raised medians and raised islands to ease snow plow blades on divided roadways.