GREEK  GUIDELINES FOR  SETTING SPEED  LIMITSB. Psarianos, S. Palaskas, Nat’l Techn. Univ. Athens, GreeceN. Stamatiadis, Un...
SPEED LIMIT?
Speed Limit: It’s a Problem               See this ExampleDesign Speed = Operating Speed = 85% Speed (as of December 2005)...
General Speed Limits:                                  The easy part                                               High sp...
Local Speed Limits The difficult part
King of the RoadIt’s always the Driver!
By The Book• Driver selects his/her safe speed accordingly• Speed Limit is set only when driver can not perceive the  safe...
Who Decides?• Engineering Study• Technical Team consisted by   – The Road Director,   – Local Police,   – Technical Chambe...
Parameters?•   Grade (Speed Differential / Variance)•   Sharp curvature•   Sight Distance•   At-Grade Intersection (genera...
For Example: Roadside       Development                Distance between Accesses (m)MAXIMUM SPEED       Rural &         Ur...
For Example: Through Traffic        at Freeways                                              CROSS                        ...
For Example: Weaving Sections       at Interchanges                                                        Speed          ...
For Example: InterchangeRamps with max Cross-Slope 6%      Inner     Curve Radius (m)              35 35 115 170 250 (340)...
More Advisory Speeds• Advice drivers on probable dangerous conditions when exceeding theadvisory speed limit like      • I...
Conclusions• A modern guide to help agencies set reliable speed limits that will beobeyed• Less necessity for enforcement•...
Rss2007 psarianos et al
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Rss2007 psarianos et al

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Greek Guidelines for Setting Speed Limits. Presented at the Road Safety and Simulation Conference 2007

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Rss2007 psarianos et al

  1. 1. GREEK GUIDELINES FOR SETTING SPEED LIMITSB. Psarianos, S. Palaskas, Nat’l Techn. Univ. Athens, GreeceN. Stamatiadis, Univ. of Kentucky, U.S.A.
  2. 2. SPEED LIMIT?
  3. 3. Speed Limit: It’s a Problem See this ExampleDesign Speed = Operating Speed = 85% Speed (as of December 2005)On the TANGENT:•Passenger Cars: 144 km/h in the driving middle lane (3.50m) –VIOLATION 24 km/h•SU Trucks: 89 km/h in the driving middle lane•Truck-Trailers: 87 km/h in the driving middle lane•Buses: 98 km/hCorinth-Athens Freeway, St.:57+550Speed Limits (km/h):120 for PCs, 80 for SU Trucks, 70 for Truck-Trailers, 90 for Buses Transportation Research Board 3 2006 Annual Meeting
  4. 4. General Speed Limits: The easy part High speed Vehicle Type FREEWAYS Other rural roads roads Passenger cars 130 110 90 Vehicle Type FREEWAYS Buses 100 90 80 Articulated Buses 70 70 70 Freeways – wet pavement 110 School Buses 80 80 60 High speed roads – wet pavement 90 Trucks ≤ 3500 kgr 100 90 80 Other road network – wet pavement 80 Trucks > 3500 kgr 85 80 80 Freeways / High speed roads - Bridges 100Semi Trailer Truck≤ 3500 kgr 80 80 70 Freeways / High speed roads - Tunnels 100Semi Trailer Truck> 3500 kgr 80 70 70 Motorcyclists ≥ 125 cc 130 110 90 Motorcyclists < 125 cc 80 80 70
  5. 5. Local Speed Limits The difficult part
  6. 6. King of the RoadIt’s always the Driver!
  7. 7. By The Book• Driver selects his/her safe speed accordingly• Speed Limit is set only when driver can not perceive the safe speed (obscured road, sudden pedestrian traffic, pavement deterioration etc.)• Speed Limit the last measure for road engineering• CONDITIONAL and EXCUSED Speed Limit
  8. 8. Who Decides?• Engineering Study• Technical Team consisted by – The Road Director, – Local Police, – Technical Chamber of Greece• Primary Reference: OPERATING SPEED (V85)• Use of Advisory Speed especially on Ramps for Heavy Traffic• Every 10 years regular reconsideration if not enforced by accident history of specific site
  9. 9. Parameters?• Grade (Speed Differential / Variance)• Sharp curvature• Sight Distance• At-Grade Intersection (generally 70 km/h)• Presence of Vulnerable road users (Children, Elderly People, Bicyclists)• Accident History• Weaving Areas• Roadside Development• Specific Sites (Schools, Stadium, Animal Passage, etc)
  10. 10. For Example: Roadside Development Distance between Accesses (m)MAXIMUM SPEED Rural & Urban roadsLIMIT (KM/H) suburban (Throug roads h roads) 70 350 - 60 300 - 50 ≤250 ≤250 ≤50 ≤200 ≤200
  11. 11. For Example: Through Traffic at Freeways CROSS Speed Limit Roadway Functional Classification SECTION (km/h) TYPE divided 130 120 110 Rural Freeways /High Speed Highways undivided 100 90 Rural Roads between regions /counties divided 110 100 Rural Roads between cities/towns divided 100 90 Urban Freeway / Urban divided 90 80
  12. 12. For Example: Weaving Sections at Interchanges Speed Weaving Weaving Type Area Comments Limit Length [m] ` [km/h] Rural Cloverleaf 100 200 & interchange Urban type 180 80 Rural 100 250 & between two 200 Urban 80 interchanges 180 Urban 60
  13. 13. For Example: InterchangeRamps with max Cross-Slope 6% Inner Curve Radius (m) 35 35 115 170 250 (340) Speed Limit (km/h) 30 40 50 60 70 (80)
  14. 14. More Advisory Speeds• Advice drivers on probable dangerous conditions when exceeding theadvisory speed limit like • Intersections with restricted visibility • Narrow Bridges or One-Lane Bridges • Downgrades greater than 6% • Ramps especially for Heavy Vehicles • On Crest and Sag Vertical Curves• It can be the operating speed or safe speed• Accompanied with explaining sign
  15. 15. Conclusions• A modern guide to help agencies set reliable speed limits that will beobeyed• Less necessity for enforcement• Better acceptance by the driving population

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