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Location <br />Vehicle Speed <br />Page 8-2 <br />Forecast Traffic <br />Volumes <br />TURN LANE DESIGN CHECKLIST (PAGE 1 OF 2) <br />STEP 1 - DATA GATHERING <br />State Roadway: J li Intersection: 1�e s4 / 4a., <br />❑ Left Turn Lane Design for Approach: N / S / E / W <br />Right Turn Lane Design for Approach: N / S 1 W <br />Choose one. Shown in order of preference. <br />kDesign Speed: ZfO mph r _�'� k �a <br />❑ 85th Percentile Speed: mph <br />❑ Statewide Average Speed_: <br />Choose one. Shown in order of oreferenae. <br />mph (Page B-2, Figure B-1) <br />Design Year Volumes (provided by District/Central <br />Office Planning Staff) 2fl I v <br />❑ Historic Volumes (existing volumes extrapolated to <br />estimate 20 year forecast volumes) <br />❑ 20 -Year Multiplier (documented by State Aid and found <br />i at the following website under County Reference Data: <br />9 http:!iwx,1v tdot.state.mn us/stateaid/sa_csah.html <br />Turning Volumes: see graphic at right, also note the <br />number of lanes for each movement. <br />Daily Volumes <br />I <br />L <br />Minor Street Daily Traffic Volumes: ("1-1;C--1*5 vehicles per day <br />do <br />279 <br />I I <br />be taken in Step 4 for deceleration and storage length of turn lane) <br />Grade <br />❑ Upgrade ❑ Downgrade <br />Page B-5 <br />Grade of approach: % (If greater than 3%, apply deceleration adjustment in Step 4) <br />37�--. <br />Is there a large seasonal variation within the corridor (recreational routes, primary farm to market routes, etc)? If <br />Variations <br />yes, consider the variation and potential increase in traffic volumes during peak periods. Is it enough of an <br />9r <br />i3 <br />I <br />Major Street Daily Traffic Volumes: vehicles per day <br />Minor Street Daily Traffic Volumes: ("1-1;C--1*5 vehicles per day <br />Heavy <br />Commercial <br />Percent Heavy Vehicle: % (If percentage of heavy commercial is high special consideration should <br />Page 8-5 <br />be taken in Step 4 for deceleration and storage length of turn lane) <br />Grade <br />❑ Upgrade ❑ Downgrade <br />Page B-5 <br />Grade of approach: % (If greater than 3%, apply deceleration adjustment in Step 4) <br />Seasonal <br />Is there a large seasonal variation within the corridor (recreational routes, primary farm to market routes, etc)? If <br />Variations <br />yes, consider the variation and potential increase in traffic volumes during peak periods. Is it enough of an <br />increase to change the design? ❑ Yes, adjust traffic volumes Wo <br />Roadway <br />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 <br />❑ Yes, on horizontal curve *c No <br />Characteristics <br />?age 8-6 <br />Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn <br />the conditions. (See Pages B-23 and 24) <br />lane design to better accommodate constrained <br />0 Yes, constrained location ❑ No <br />STEP 2 — DETERMINE FACILITY TYPE <br />Determine <br />Rural vs. Urban (based on Access Management Category Assignments: <br />Facility Type <br />Page 8-3 <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 B -y <br />Development of Turn Lane Design Guidelines <br />