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TURN LANE DESIGN CHECKLIST (PAGE I OF 2) STEP 1 - DATA GATHERING — Location State Roadway: Intersection: Left Turn Lane Design for Approach: N / S / E / W ❑ Right Turn Lane Design for Approach S d Choose one. Shown in order of preference. N / S / E / W Vehicle pee Page 3-2 lX Design Speed: !�O- mph 14 ❑ 85th Percentile Speed: mph Forecast Traffic Volumes Page 3-3 Heavy Commercial Page 8-5 Grade Page 3-5 Seasonal Variations Page 3-4 Roadway Geometry and Corridor Characteristics Page 3-6 Determine Facility Type Page 3-3 ❑ Statewide Average Speed: Choose one. Shown in order of preference. mnh (naae B-2. Fiaure B-1) ��,Design Year Volumes (provided by District/Central ce Planning Staff) , 4 0 ❑ Historic Volumes (existing volumes extrapolated to estimate 20 year forecast volumes) ❑ 20 -Year Multiplier (documented by State Aid and found at the following website under County Reference Data: http'//wNvv dot.state,mn.usi'stateaid/sa_ sah.htmI Turning Volumes: see graphic at right, also note the number of lanes for each movement. Daily Volumes ff t Major Street Daily Traffic Volumes: y a'' vehicles per day Minor Street Daily Traffic Volumes: vehicles per day Percent Heavy Vehicle: 1 % (If percentage of heavy commercial is high special consideration should be taken in Step 4 for deceleration and storage length of turn lane) ❑ Upgrade ❑ Downgrade Grade of approach:. % (If greater than 3%, apply deceleration adjustment in Step 4) Is there a large seasonal variation within the corridor (recreational routes, primary farm to market routes, etc)? If yes, consider the variation and potential increase in traffic volumes during peak periods. Is it enough of an increase to change the design? ❑ Yes, adjust traffic volumes XNo Is the intersection located on a horizontal curve? If yes, adjust taper in Step 4. (See Page B-17 and Table B-8) ❑ Yes, on horizontal curve X No Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn lane design to better accommodate the constrained conditions. (See Pages B-23 and 24) U Yes, constrained location ❑ No STEP 2 - DETERMINE FACILITY TYPE Rural vs. Urban (based on Access Management Category Assignments: PS Urban ❑ Rural Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) ❑ Expressway *'< Conventional Intersection ❑ Signalized: sec cycle length 'A Unsignalized ❑ Future Signal? (see Figure B-3) Control Paye 3-9 Development of Turn Lane Design Guidelines I Major Street Daily Traffic Volumes: y a'' vehicles per day Minor Street Daily Traffic Volumes: vehicles per day Percent Heavy Vehicle: 1 % (If percentage of heavy commercial is high special consideration should be taken in Step 4 for deceleration and storage length of turn lane) ❑ Upgrade ❑ Downgrade Grade of approach:. % (If greater than 3%, apply deceleration adjustment in Step 4) Is there a large seasonal variation within the corridor (recreational routes, primary farm to market routes, etc)? If yes, consider the variation and potential increase in traffic volumes during peak periods. Is it enough of an increase to change the design? ❑ Yes, adjust traffic volumes XNo Is the intersection located on a horizontal curve? If yes, adjust taper in Step 4. (See Page B-17 and Table B-8) ❑ Yes, on horizontal curve X No Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn lane design to better accommodate the constrained conditions. (See Pages B-23 and 24) U Yes, constrained location ❑ No STEP 2 - DETERMINE FACILITY TYPE Rural vs. Urban (based on Access Management Category Assignments: PS Urban ❑ Rural Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) ❑ Expressway *'< Conventional Intersection ❑ Signalized: sec cycle length 'A Unsignalized ❑ Future Signal? (see Figure B-3) Control Paye 3-9 Development of Turn Lane Design Guidelines