More Related Content
![02-A Components of Traffic System [Road Users and Vehicles] (Traffic Engineer...](https://cdn.slidesharecdn.com/ss_thumbnails/02acomponentsoftsroadusersvehicles-200412120058-thumbnail.jpg?width=560&fit=bounds)
Similar to Level of service (los) multilane hwys 02 (transportation engineering) (6)
Level of service (los) multilane hwys 02 (transportation engineering)
- 1. LOS Analysis of Multilane Highways
- 2. Key Differences B/W Freeways and Multilane Highways Vehicles access; no full access control for multilane highways Multilane highways may or may not be divided Traffic signals may be present Design standards, e.g. speeds are lower as compared to freeways More distraction along the multilane highway
- 5. Base Conditions for Multilane Highways LOS Analysis 12 ft lane width 12 ft min total lateral clearance from road side objects (right shoulder and median) Only passenger cars in traffic stream No direct access points Divided highways Level terrain Familiar drivers FFS of 60 mph or more
- 6. FFS • FFS = BFFS – fLW - fLC - fM - fA • BFFS ; – 7 mph + posted limit of 40 to 45 mph – 5 mph + posted limit of 50 mph or higher • fLW = Lane width adjustment factor (Same as freeways) • fLC = Lateral clearance adjustment factor
- 7. fLC Lateral clearance adjustment factor • TLC = LCR + LCL • TLC = Total Lateral Clearance • LCR = Right side lateral clearance to obstruction • LCL= Left side lateral clearance to obstruction • For undivided highways: LCL= 6 ft • If lateral clearance on any side exceeds 6 ft, it is taken as 6 ft.
- 8. FFS and Capacity on Multilane Highways
- 9. Adjustment for Lateral Clearance - TLC
- 10. Adjustment for Median Clearance - fM
- 11. Two Way Left Turn Lane (TWLTL)
- 12. Adjustment for Access Point Frequency - fA
- 13. Example
- 14. Example FFS = BFFS – fLW - fLC - fM - fA
- 15. FFS • FFS = BFFS – fLW - fLC - fM - fA • BFFS ; – 7 mph + posted limit of 40 to 45 mph – 5 mph + posted limit of 50 mph or higher • fLW = Lane width adjustment factor (Same as freeways) • fLC = Lateral clearance adjustment factor
- 16. Example FFS = BFFS – fLW - fLC - fM - fA
- 17. Example fLW
- 18. Example FFS = BFFS – fLW - fLC - fM - fA
- 19. Example
- 20. Adjustment for Lateral Clearance - TLC
- 21. Adjustment for Median Clearance - fM
- 22. Example FFS = BFFS – fLW - fLC - fM - fA
- 23. Adjustment for Access Point Frequency - fA 2 access points per mile
- 24. Example FFS = BFFS – fLW - fLC - fM - fA
- 25. Example
- 26. Determination of ET and ER
- 28. Density D = vp / S • FFS = 52 mph • Flow Rate = 1500.3 pc/hr/ln • Average Passenger Car Speed (S) = 52 mph • Density (D) = = Flow Rate (pc/h/ln) / Average Passenger Car Speed = 1500.3/52 = 28.85 pc/mi/ln
- 29. 52 1500.3 LOS-D