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TURN LANE DESIGN CHECKLIST (PAGE 1 OF 2) <br />STEP 1 - DATA GATHERING - <br />Location State Roadway: r ` ?' Intersection: W,_5 F I <br />�( Left Turn Lane Design for Approach: N / S /(5/ W <br />❑ Right Turn Lane Design for Approach: N / S / E / W <br />Vehicle Speed Choose one. Shown in order of preference. <br />B-2 El Design Speed: 140 mph 5��1��, ti� -� !,A - <br />Page <br />❑ 851" Percentile Speed: mph <br />❑ Statewide Average Speed: mph (page B-2, Figure B-1) <br />Forecast Traffic Choose one. Shown in order of preference. $ tw <br />Volumes 1&Design Year Volumes (provided by District/Central !,( <br />F Page $_3 Office Planning Staff) 2Cr7- 'I Y� <br />df <br />❑ Historic Volumes (existing volumes extrapolated to - <br />estimate 20 year forecast volumes) <br />E <br />❑ 20-Year Multiplier (documented by State Aid and found p <br />at the followingwebsite under County Reference Data: <br />tY <br />http://wvvw.dot state mP,us/stateaid/sa_csah.html <br />Turning Volumes: see graphic at right, also note the f 4 <br />number of lanes for each movement. <br />Daily Volumes <br />i <br />Major Street Daily Traffic Volumes: 5ooO vehicles per day <br />Minor Street Daily Traffic Volumes: -7y3 vehicles per day <br />Heavy <br />Commercial Percent Heavy Vehicle: I % (If percentage of heavy commercial is high special consideration should <br />Page a-5 be taken in Step 4 for deceleration and storage length of turn lane) <br />Grade <br />❑ Upgrade ❑Downgrade <br />Page s_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 a-4 increase to change the design? ❑ Yes, adjust traffic volumes NQ 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 ). No <br />Characteristics Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn <br />Page B-6 lane design to better accommodate the constrained conditions. (See Pages B-23 and 24) <br />Yes, constrained location ❑ No <br />STEP 2 — DETERMINE FACILITY TYPE <br />Determine Rural vs. Urban (based on Access Management Category Assignments: <br />Facility Type <br />Page 8-8 LkUrban ❑ Rural <br />Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) <br />❑ Expressway `Conventional <br />L <br />Intersection ❑ Signalized: sec cycle length ',Unsignalized ❑ Future Signal? (see Figure B-3) <br />Control <br />Pale ,) <br />Development of Turn Lane Design Guidelines <br />