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I— Location Vehicle Speed Page B-7 TURN LANE DESIGN CHECKLIST (PAGE 1 OF 2) STEP 1 — DATA GATHERING State Roadway: f '�!� + 1 '0 Left Tura Lane Design for Approach: ❑ Right Turn Lane Design for Approach Choose one. Shown in order of preference. 'P& Design Speed: � mph -4' -35;110 � ❑ 85ffi Percentile Speed: mph _ ❑ Statewide Average Speed: Forecast Traffic Choose one. Shown in order of preference. Intersection: .. NISOW N / S / E / W /o ,4. X C.r 60e mph (page B-2, Figure B-1) Volumes Design Year Volumes (provided by District/Central Page a-s Office Planning Staff)-2.2Z ❑ Historic Volumes (existing volumes extrapolated to Heavy Commercial Page B-5 Grade Page 8-5 Seasonal Variations Page B-4 Roadway Geometry and Corridor Characteristics I Page B-8 Determine Facility Type Page B-8 I� estimate 20 year forecast volumes) ❑ 20-Year Multiplier (documented by State Aid and found I at the following website under County Reference Data: http://www.dot, state, mn, usistateaid/sa_csah. htm Turning Volumes: see graphic at right, also note the number of lanes for each movement. Daily Volumes Major Street Daily Traffic Volumes: � oc,�, vehicles per day Minor Street Daily Traffic Volumes: 7t"r vehicles per day Percent Heavy Vehicle: % (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 ' • No 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 )i0o 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) XYes, constrained location ❑ No STEP 2 — DETERMINE FACILITY TYPE Rural vs. Urban (based on Access Management Category Assignments: oc i'l!e4 KUrban ❑ Rural Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) ❑ Expressway 'jLConventional Intersection ❑ Signalized: sec cycle lengthUnsignalized ❑ Future Signal? (see Figure B-3) i Control Page B-9 .. .............. . Development of Turn Lane Design Guidelines