Final presentation

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The final presentation to my senior project, a feasibility study for a proposed highway on-ramp.

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Final presentation

  1. 1. OVERVIEW• Introduction • Environmental Impacts• Background • Cost Estimation• Demand • Alternatives• Design • Final Recommendation
  2. 2. INTRODUCTIONPURPOSE• County can determine proposed onramp’s necessity• Helps County prioritize where the onramp fits in the implementation of Community Plan (if it fits at all) NOT A PROPOSAL
  3. 3. BACKGROUNDPopulation and Surrounding LandUses• Existing population of 1,835• Projected population of 5,182• Surrounding land uses • Currently: SF Residential & Commercial • Community Plan will increase amount and types of land
  4. 4. BACKGROUNDExisting Onramp Conditions• Four connections to Highway 101 • Northern and Southern Mission • 10th Street • Cemetery Road
  5. 5. BACKGROUNDExisting Onramp Conditions• Current Onramps are not ideal• S. Mission southbound onramp enters into fast lane• 10th Street not a complete interchange • Does not comply with Caltrans standards • Lacks southbound onramp
  6. 6. BACKGROUNDExisting Onramp Conditions• Cemetery Road: • Drivers must travel over a mile to enter freeway • No speed limit signs • Treated as one, large onramp • Prevalent cracking and deterioration in asphalted pavement
  7. 7. BACKGROUNDExisting Onramp ConditionsOnramp Distribution: • S. Mission is more popular despite safety concerns Caltrans Traffic Volumes for 2008 Onramp/Direction Average Daily Trips Cemetery Road/ SB On 850 S. Mission St./ SB On 1700 S. Mission St./ NB Off 1800 10th St./ NB Off 800 10th St./ SB Off 300
  8. 8. DEMANDSocial Demand• Shorter travel distance preferred• Safer conditions • Cemetery Road treated as one, large onramp• Reduces traffic off Cemetery Road • Preferred for future residential development west of Cemetery Road
  9. 9. DEMANDSocial Demand• 87% community workshop feedback in favor of improved onramp interchange
  10. 10. DEMANDTechnical Demand• Ultimate goal to find Cemetery Road future Level of Service (LOS)• Trip generation based on land use and land use area
  11. 11. DEMAND Technical Demand • Trip Generation Total Trip GenerationDaily Trips AM Peak Hour PM Peak Hour AM In AM Out Pass By PM In PM Out Pass By 128,091 7,062 13,853 10,110 1,916 444 4,570 6,197 3,086 •Focus is on PM Out trips
  12. 12. DEMANDTechnical Demand• Where are these trips going? • How many are leaving San Miguel? • Of these, how many are using Cemetery Road?
  13. 13. DEMANDTechnical Demand• Trip Distribution Distribution Analysis Distribution 2000 ADT 2003 ATD 2008 ATD Average Northbound 24.09% 20.83% 22.15% 22.36% Southbound 75.91% 79.17% 77.85% 77.64% Southbound Distribution Analysis Distribution 2000 ADT 2003 ATD 2008 ATD Average Cemetery Road 42.31% 44.74% 33.33% 40.13% South Mission 57.69% 55.26% 66.67% 59.87%
  14. 14. DEMANDTechnical Demand• Level of Service • Based on Transportation Research Board’s Highway Capacity Manual (2000) • Volume-Capacity Ratio • Cemetery Road capacity at 1,600 vehicles per hour per lane
  15. 15. DEMANDTechnical Demand• Level of Service C Threshold • To cross threshold of Level ofTrips Using Cemetery # Trips Leaving San LOS Service # C, trips leaving must % Trips Leaving San Miguelabout 60% (v/c threshold at 0.71) Level of Service at exceed Miguel Rd V/C Ratio 75 4,648 1,448 0.91 F • 60% on the conservative side based on land 70 4,338 1,352 0.84 D uses providing internal trips 1,255 65 60 4,028 3,718 1,158 0.78 0.72 D D • Range likely under 55% 55 3,408 1,062 0.66 C 50 3,099 965 0.60 C 45 2,789 869 0.54 C 40 2,479 772 0.48 B 35 2,169 676 0.42 B
  16. 16. DEMANDTechnical Demand New interchange not necessary Level of Service # Trips Leaving San # Trips Using Cemetery% Trips Leaving San Miguel Miguel Rd V/C Ratio Level of Service 75 4,648 1,448 0.91 F 70 4,338 1,352 0.84 D 65 4,028 1,255 0.78 D 60 3,718 1,158 0.72 D 55 3,408 1,062 0.66 C 50 3,099 965 0.60 C 45 2,789 869 0.54 C 40 2,479 772 0.48 B 35 2,169 676 0.42 B
  17. 17. DESIGNDimensions• Length at 700 feet • Average acceleration time and necessary length to reach 65mph (465 feet) • Distance at which drivers can clearly see traffic on highway (additional 245 Cemetery Road feet) • Consistent with northbound onramp Cemetery Road Cemetery Road Cemetery Road
  18. 18. DESIGNDimensions• Width at 24 feet • Based on Caltrans Highway Design Manual • 12 foot single lane width • 8 foot paved right shoulder • 4 foot paved left shoulder Cemetery Road Cemetery Road Cemetery Road Cemetery Road
  19. 19. DESIGNAdditional Considerations• Relocation of Cemetery Road Intersection • Based on Caltrans Highway Design Manual • At least 400 feet westward Cemetery Road Cemetery Road Cemetery Road Cemetery Road
  20. 20. ENVIRONMENTAL IMPACTSAir Quality• Temporary rise in particulate matterHabitat• Threatened and endangered species within 1 mile radius of San Miguel • San Joaquin Kit Fox – Not near onramp site• Soil: Legend • Valuable agricultural soil may pose as a constraint for development
  21. 21. ENVIRONMENTAL IMPACTSTopography & Hydrology• Onramp site not affected by topographical and hydrological constraints • Not within 100-year floodplain• Slope on project site permits development• Drainage ditch partially paved over
  22. 22. COST ESTIMATION• From numerous sources: • Rene’ Walker, Office Engineer • Colin Jones, Chief of Public Affairs • Willow Road Interchange Project• Cost • Caltrans Budget for • $400 - $600 thousand District 5 • Considers construction, Highway Projects labor, equipment, •$350-400 million environmental review
  23. 23. ALTERNATIVES Alternative Total Cost Extra Cost10th Street Interchange Improvement $400,000 - $600,000 -S. Mission Improvement $300,000 - $400,000 $65,000 / yrCemetery Road Improvement $195,200 -Cemetery Road Improvement W/ Meter $495,200 - $ 595,200 $65,000 / yrS.Mission & Cemetery Road Improvement $495,200 - $595,200 $65,000 / yrNo Build - -
  24. 24. RECOMMENDATION• Consider alternatives • Alleviates more immediate issues • Demand not met
  25. 25. THANK YOU

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