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TURN LANE DESIGN CHECKLIST (PAGE 1 OF 2) <br />STEP 1 — DATA GATHERING <br />Location ��,rr ♦ . I <br />State Roadway: _ -Ft Intersection: �. -. <br />,)N-Left Turn Lane Design for Approach: N 1 S. E� W <br />� <br />❑ Right Turn Lane Design for Approach: N / S / E / W <br />Vehicle Speed Choose one. Shown in order of preference. <br />r � le. -Page B-7 �• Design Speed: /�1 � mph �'���''�"�- /� '`'�� v P�'"¢ �° <br />❑ 85ffi Percentile Speed: mph <br />❑ Statewide Average Speed: mph (page B-2, Figure B-1) <br />Forecast Traffic Choose one. Shown in order of preference. Ar <br />Volumes k Design Year Volumes (provided by District/Central, <br />Page B-3 Office Planning Staff)-2.2Z <br />❑ Historic Volumes (existing volumes extrapolated to <br />estimate 20 year forecast volumes) I L <br />❑ 20-Year Multiplier (documented by State Aid and found <br />at the following website under County Reference Data: <br />http://wwvv,dot•state.mn.us/stateaid/sa_csah.htmi <br />Turning Volumes: see graphic at right, also note the j <br />number of lanes for each movement. J <br />Daily Volumes <br />Major Street Daily Traffic Volumes: vehicles per day <br />Minor Street Daily Traffic Volumes: vehicles per day <br />Heavy <br />Commercial Percent Heavy Vehicle: % (If percentage of heavy commercial is high special consideration should <br />Paae B-5 be taken in Step 4 for deceleration and storage length of turn lane) <br />Grade <br />❑ Upgrade El Downgrade <br />Page B-5 <br />Grade of approach: % (If greater than 3%, apply deceleration adjustment in Step 4) <br />Seasonal Is there a large seasonal variation within the corridor (recreational routes, primary farm to market routes, etc)? If <br />Variations yes, consider the variation and potential increase in traffic volumes during peak periods. Is it enough of an <br />Page B-4 increase to change the design? ❑ Yes, adjust traffic volumes '�<No <br />Roadway Is the intersection located on a horizontal curve? If yes, adjust taper in Step 4. (See Page B-17 and Table B-8) <br />Geometry and <br />Corridor ❑ Yes, on horizontal curve )i0o <br />Characteristics Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn <br />Page B-S lane design to better accommodate the constrained conditions. (See Pages B-23 and 24) <br />XYes, constrained location ❑ No <br />STEP 2 — DETERMINE FACILITY TYPE <br />Determine Rural vs. Urban (based on Access Management Category Assignments: <br />Facility Type, r� ,� s E� .,r� de <br />Page B-s KUrban ❑ Rural <br />Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) <br />❑ Expressway 'jLConventional <br />Intersection ❑ Signalized: sec cycle lengthUnsignalized ❑ Future Signal? (see Figure B-3) <br />Control <br />Page B-9 <br />Development of Turn Lane Design Guidelines <br />