Laserfiche WebLink
Location <br />Vehicle Speed <br />Page B•2 <br />Forecast Traffic <br />Volumes <br />Page B-3 <br />L <br />i Heavy <br />Commercial <br />Page B-5 <br />f Grade <br />f Page B-5 <br />Seasonal <br />Variations <br />Page B-4 <br />Roadway <br />Geometry and <br />Corridor <br />Characteristics <br />Page B-& <br />TURN LANE DESIGN CHECKLIST (F <br />STEP 1 — DATA GATHERING <br />State Roadway: 1' "� S:. Intersection: <br />i <br />V Left Turn Lane Design for Approach: N / S /(5/ W <br />❑ Right Turn Lane Design for Approach: N / S / E / W <br />Choose one. Shown in order of preference. <br />❑ Design Speed: 40 mph A SSa�-i-n-%a, 10 <br />❑ 851" Percentile Speed: mph <br />❑ Statewide Average Speed: <br />Choose one. Shown in order of preference. <br />mph (page B-2, Figure B-1) <br />1&Design Year Volumes (provided by District/Central <br />Office Planning Staff) 2.Cr7- 2.. <br />❑ Historic Volumes (existing volumes extrapolated to <br />estimate 20 year forecast volumes) <br />❑ 20-Year Multiplier (documented by State Aid and found <br />at the following website under County Reference Data: <br />http://wvvw.dot 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 />Major Street Daily Traffic Volumes: 5000 vehicles per day <br />Minor Street Daily Traffic Volumes: .__ -7y3 vehicles per day <br />11f <br />Percent Heavy Vehicle: �I .......,% (If percentage of heavy commercial is high special consideration should <br />be taken in Step 4 for deceleration and storage length of turn lane) <br />❑ Upgrade ❑ Downgrade <br />Grade of approach: - % (If greater than 3%, apply deceleration adjustment in Step 4) <br />Is there a large seasonal variation within the corridor (recreational routes, primary farm to market routes, etc)? If <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 `Q No <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 />❑ Yes, on horizontal curve ). No <br />Are there adjacent intersections that may influence the turn lane design? If yes, consider adjustments to the turn <br />lane design to better accommodate the constrained conditions. (See Pages B-23 and 24) <br />XYes, 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 B-a(Urban ❑ Rural <br />Expressway vs. Conventional (determined by Mn/DOT Office of Traffic, Safety and Technology) <br />❑ Expressway `Conventional <br />Intersection <br />Control ❑ Signalized: sec cycle length ',Unsignalized <br />Page 8-'' <br />❑ Future Signal? (see Figure B-3) <br />Development of Turn Lane Design Guidelines <br />