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TTEng 422 s2021 Module 4: Traffic Calming

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Wael ElDessouki

In this module, we will present the different tools for traffic calming and the purpose of traffic calming.

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Module 4: Traffic Calming Concepts TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki Spring 2021 192
Traffic Calming: What are Traffic Calming measures? Traffic calming measures are physical road design elements and non-physical measures intended to reduce vehicle speeds and improve driver attentiveness. TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 193 Spring 2021
Traffic Calming Concepts: That will results in: Objective: TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 194 Spring 2021
Traffic Calming Measures: Toolbox Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 195 Spring 2021
Traffic Calming Measures: Problem Types Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 196 Spring 2021
Traffic Calming Measures Selection & Problem Types Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 197 Spring 2021
Traffic Calming Measures Selection & Problem Types Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 198 Spring 2021
Traffic Calming Measures Selection & Location Type Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 199 Spring 2021
Traffic Calming Measures Selection & Location Type Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 200 Spring 2021
Traffic Calming Measures & Traffic Constraints Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 201 Spring 2021
Traffic Calming Measures & Traffic Constraints Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 202 Spring 2021
Traffic Calming Measures & Traffic Constraints Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 203 Spring 2021
Traffic Calming Concepts: Narrowing (Bulbouts) TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 204 Spring 2021
Traffic Calming Concepts: Narrowing (Two Lane Chokers) TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 205 Spring 2021
Traffic Calming Concepts : Narrowing Measures (Center Island Narrowing) TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 206 Spring 2021
Traffic Calming Concepts: Narrowing Measures (Pedestrian Refuge Islands) Before After TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 207 Spring 2021
Traffic Calming Concepts: Horizontal Measures Roundabout TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 208 Spring 2021
Traffic Calming Concepts: Horizontal Measures Traffic Circle TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 209 Spring 2021
Traffic Calming Concepts: Horizontal Measures Lateral Shifts TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 210 Spring 2021
Traffic Calming Concepts: Horizontal Measures Chicanes TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 211 Spring 2021
Traffic Calming Concepts: Horizontal Measures TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 212 Spring 2021
Traffic Calming Concepts: Non Physical Measures TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 213 Spring 2021
Traffic Calming Concepts: : Non Physical Measures TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 214 Spring 2021
Traffic Calming Concepts: : Non Physical Measures TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 215 Spring 2021
Traffic Calming Concepts: Vertical Measures Speed Bump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 216 Spring 2021
Traffic Calming Concepts: Vertical Measures Speed Hump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 217 Spring 2021
Traffic Calming Concepts: Vertical Measures Speed Table TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 218 Spring 2021
Traffic Calming Concepts: Divergence Measures Full Road Closure TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 219 Spring 2021
Traffic Calming Concepts: Divergence Measures Partial Road Closure TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 220 Spring 2021
Traffic Calming Concepts: Divergence Measures Diagonal Road Closure TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 221 Spring 2021
Traffic Calming Concepts: Divergence Measures Median Barrier TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 222 Spring 2021
Traffic Calming Concepts: Divergence Measures Forced Turn Exit TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 223 Spring 2021
Case Studies: Speed Hump Assessment TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 224 Spring 2021
Impact of Speed Hump on Capacity & LOS  Speed humps are common traffic calming technique that is being used in several cities allover the world.  The main objective of speed humps is to reduce the speed of the traffic.  However, it has serious impact over the overall capacity of the approach. After Speed Hump Flow Rate Q (veh/lane/hr) Density D (veh/lane/km) Jam Density Critical Density 0 Original Capacity Without Speed Hump with Speed hump 0 Capacity At Speed Hump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 225 Spring 2021
Impact of Speed Hump on Capacity & LOS  Speed humps are common traffic calming technique that is being used in several cities allover the world.  The main objective of speed humps is to reduce the speed of the traffic.  However, it has serious impact over the overall capacity of the approach. Example: After Speed Hump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 226 Spring 2021
Impact of Speed Hump on Capacity & LOS Operational Case: Existing Facility Example: Study the Effect of adding a speed hump on LOS and the Overall capacity of the following approach. Input: Number of Lanes = 3 Lane Width= 3.4 Median = Yes Shoulders = 0.6 Traffic Volume = 1275 Topography (i.e. Terrain: Level /Rolling/ Mountainous) HV% = 12% PHF = 0.9 , Access points = 6 acc. Pt. /km Observed Speed = 70 km/hr , TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 227 Spring 2021
End of Module 4: TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 228 Spring 2021

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TTEng 422 s2021 Module 4: Traffic Calming

  • 1. Module 4: Traffic Calming Concepts TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki Spring 2021 192
  • 2. Traffic Calming: What are Traffic Calming measures? Traffic calming measures are physical road design elements and non-physical measures intended to reduce vehicle speeds and improve driver attentiveness. TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 193 Spring 2021
  • 3. Traffic Calming Concepts: That will results in: Objective: TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 194 Spring 2021
  • 4. Traffic Calming Measures: Toolbox Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 195 Spring 2021
  • 5. Traffic Calming Measures: Problem Types Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 196 Spring 2021
  • 6. Traffic Calming Measures Selection & Problem Types Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 197 Spring 2021
  • 7. Traffic Calming Measures Selection & Problem Types Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 198 Spring 2021
  • 8. Traffic Calming Measures Selection & Location Type Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 199 Spring 2021
  • 9. Traffic Calming Measures Selection & Location Type Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 200 Spring 2021
  • 10. Traffic Calming Measures & Traffic Constraints Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 201 Spring 2021
  • 11. Traffic Calming Measures & Traffic Constraints Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 202 Spring 2021
  • 12. Traffic Calming Measures & Traffic Constraints Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008 TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 203 Spring 2021
  • 13. Traffic Calming Concepts: Narrowing (Bulbouts) TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 204 Spring 2021
  • 14. Traffic Calming Concepts: Narrowing (Two Lane Chokers) TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 205 Spring 2021
  • 15. Traffic Calming Concepts : Narrowing Measures (Center Island Narrowing) TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 206 Spring 2021
  • 16. Traffic Calming Concepts: Narrowing Measures (Pedestrian Refuge Islands) Before After TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 207 Spring 2021
  • 17. Traffic Calming Concepts: Horizontal Measures Roundabout TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 208 Spring 2021
  • 18. Traffic Calming Concepts: Horizontal Measures Traffic Circle TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 209 Spring 2021
  • 19. Traffic Calming Concepts: Horizontal Measures Lateral Shifts TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 210 Spring 2021
  • 20. Traffic Calming Concepts: Horizontal Measures Chicanes TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 211 Spring 2021
  • 21. Traffic Calming Concepts: Horizontal Measures TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 212 Spring 2021
  • 22. Traffic Calming Concepts: Non Physical Measures TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 213 Spring 2021
  • 23. Traffic Calming Concepts: : Non Physical Measures TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 214 Spring 2021
  • 24. Traffic Calming Concepts: : Non Physical Measures TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 215 Spring 2021
  • 25. Traffic Calming Concepts: Vertical Measures Speed Bump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 216 Spring 2021
  • 26. Traffic Calming Concepts: Vertical Measures Speed Hump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 217 Spring 2021
  • 27. Traffic Calming Concepts: Vertical Measures Speed Table TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 218 Spring 2021
  • 28. Traffic Calming Concepts: Divergence Measures Full Road Closure TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 219 Spring 2021
  • 29. Traffic Calming Concepts: Divergence Measures Partial Road Closure TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 220 Spring 2021
  • 30. Traffic Calming Concepts: Divergence Measures Diagonal Road Closure TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 221 Spring 2021
  • 31. Traffic Calming Concepts: Divergence Measures Median Barrier TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 222 Spring 2021
  • 32. Traffic Calming Concepts: Divergence Measures Forced Turn Exit TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 223 Spring 2021
  • 33. Case Studies: Speed Hump Assessment TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 224 Spring 2021
  • 34. Impact of Speed Hump on Capacity & LOS  Speed humps are common traffic calming technique that is being used in several cities allover the world.  The main objective of speed humps is to reduce the speed of the traffic.  However, it has serious impact over the overall capacity of the approach. After Speed Hump Flow Rate Q (veh/lane/hr) Density D (veh/lane/km) Jam Density Critical Density 0 Original Capacity Without Speed Hump with Speed hump 0 Capacity At Speed Hump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 225 Spring 2021
  • 35. Impact of Speed Hump on Capacity & LOS  Speed humps are common traffic calming technique that is being used in several cities allover the world.  The main objective of speed humps is to reduce the speed of the traffic.  However, it has serious impact over the overall capacity of the approach. Example: After Speed Hump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 226 Spring 2021
  • 36. Impact of Speed Hump on Capacity & LOS Operational Case: Existing Facility Example: Study the Effect of adding a speed hump on LOS and the Overall capacity of the following approach. Input: Number of Lanes = 3 Lane Width= 3.4 Median = Yes Shoulders = 0.6 Traffic Volume = 1275 Topography (i.e. Terrain: Level /Rolling/ Mountainous) HV% = 12% PHF = 0.9 , Access points = 6 acc. Pt. /km Observed Speed = 70 km/hr , TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 227 Spring 2021
  • 37. End of Module 4: TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 228 Spring 2021