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Location Vehicle Speed Page 8-2 Forecast Traffic Volumes Page B-3 TURN LANE DESIGN CHECKLIST (PAGE 1 OF 2) STEP 1 — DATA GATHERING i _- State Roadway: Intersection: I_Left Turn Lane Design for Approach: N / S � W + J Right Turn Lane Design for Approach: N / S / E / W Choose one. Shown in order of preference. i '1!5(Pesign Speed: q0 mph ❑ 85'h Percentile Speed: mph ❑ Statewide Average Speed: mph (page B-2, Figure B-1) Choose one. Shown in order of preference. X Design Year Volumes (provided by District/Central Office Planning Staff) 7,02Z ❑ 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:/hwww dot state.mn us/stateaid/sa_csah,html Turning Volumes: see graphic at right, also note the number of lanes for each movement. Daily Volumes Major Street Daily Traffic Volumes:D vehicles per day Minor Street Daily Traffic Volumes: vehicles per day Heavy Commercial Percent Heavy Vehicle: % (If percentage of heavy commercial is high special consideration should Page $-5 be taken in Step 4 for deceleration and storage length of turn lane) Grade ❑ Upgrade ❑ Downgrade Page 8-5 Grade of approach: 9_% (If greater than 3%, apply deceleration adjustment in Step 4) Seasonal Is there a large seasonal variation within the corridor (recreational routes, primary farm to market routes, etc)? If Variations yes, consider the variation and potential increase in traffic volumes during peak periods. Is it enough of an Page B-4 increase to change the design? ❑ Yes, adjust traffic volumes X No Roadway Is the intersection located on a horizontal curve? If yes, adjust taper in Step 4. (See Page B-17 and Table B-8) Geometry and Corridor ❑ Yes, on horizontal curve A No Characteristics Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn Page B -o lane design to better accommodate the constrained conditions. (See Pages B-23 and 24) fl' Yes, constrained location ❑ No STEP 2 — DETERMINE FACILITY TYPE Determine Rural vs. Urban (based on Access Management Category Assignments: Facility Type _: J.� __��,� �' -- a `� , ,_= Page B -a LXUrban ❑ Rural Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) ❑ Expressway Conventional Intersection ❑ Signalized: sec cycle length Unsignalized ❑ Future Signal? (see Figure B-3) Control Page 8-.9 Development of Turn Lane Design Guidelines J 1 I. Major Street Daily Traffic Volumes:D vehicles per day Minor Street Daily Traffic Volumes: vehicles per day Heavy Commercial Percent Heavy Vehicle: % (If percentage of heavy commercial is high special consideration should Page $-5 be taken in Step 4 for deceleration and storage length of turn lane) Grade ❑ Upgrade ❑ Downgrade Page 8-5 Grade of approach: 9_% (If greater than 3%, apply deceleration adjustment in Step 4) Seasonal Is there a large seasonal variation within the corridor (recreational routes, primary farm to market routes, etc)? If Variations yes, consider the variation and potential increase in traffic volumes during peak periods. Is it enough of an Page B-4 increase to change the design? ❑ Yes, adjust traffic volumes X No Roadway Is the intersection located on a horizontal curve? If yes, adjust taper in Step 4. (See Page B-17 and Table B-8) Geometry and Corridor ❑ Yes, on horizontal curve A No Characteristics Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn Page B -o lane design to better accommodate the constrained conditions. (See Pages B-23 and 24) fl' Yes, constrained location ❑ No STEP 2 — DETERMINE FACILITY TYPE Determine Rural vs. Urban (based on Access Management Category Assignments: Facility Type _: J.� __��,� �' -- a `� , ,_= Page B -a LXUrban ❑ Rural Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) ❑ Expressway Conventional Intersection ❑ Signalized: sec cycle length Unsignalized ❑ Future Signal? (see Figure B-3) Control Page 8-.9 Development of Turn Lane Design Guidelines