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I <br />i Location <br />Vehicle Speed <br />Page 8-2 <br />Forecast Traffic <br />Volumes <br />Page 8-3 <br />Heavy <br />Commercial <br />rag. <br />TURN LANE DESIGN CHECKLIST (PAGE 1 OF 2) <br />.... ...... ........... <br />__ <br />STEP 1 - DATA GATHERING I <br />State Roadway: _ /� -----Intersection: <br />))Left Turn Lane Design for Approach: N / S / W <br />D Right Turn Lane Design for Approach: N / S / E / W <br />Choose one. Shown in order of preference. i <br />Design Speed: _ mph k..,;u <br />❑ 85th Percentile Speed: mph <br />❑ Statewide Average Speed: mph (page B-2, Figure B-1) <br />........... __....— <br />Chause one. Shown in order of preference. <br />Design Year Volumes (provided by District/Central <br />ffice Planning Staff) 2_0 L/. f) <br />❑ Historic Volumes (existing volumes extrapolated to <br />estimate 20 year forecast volumes) <br />❑ 20-Year Multiplier (documented by State Aid and found <br />at the following website under County Reference Data: <br />http:11AAAmN dot. state, mn.usrstatea id%sa_csah html <br />Turning Volumes: see graphic at right, also note the <br />number of lanes for each movement. <br />Daily Volumes <br />Li <br />14L <br />Major Street Daily Traffic Volumes: 3� vehicles per day <br />Minor Street Daily Traffic Volumes: — vehicles per day <br />Percent Heavy Vehicle: i % (If percentage of heavy commercial is high special consideration should <br />be taken in Step 4 for deceleration and storage length of turn lane) <br />Grade ❑ Upgrade ❑ Downgrade <br />Page B-5 I <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 a-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 V No <br />Characteristics Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn <br />Page e-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 <br />�} Urban ❑ Rural <br />Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) <br />❑ Expressway Conventional <br />Intersection ❑ Signalized: sec cycle length Unsignalized ❑ Future Signal? (see Figure B-3) <br />Control <br />Page 8-9 <br />_ T Development of Turn Lane Design Guidelines <br />