10/27/2009. Small Roundabout: Single-Lane-Circle (35 45 m diameter) Mini Roundabout: Single-Lane-Circle (13 22 m diameter) 1. Types of roundabouts
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1 Support for Implementing Measures for the South East Core Regional Transport Network Multi Annual Plan (EuropeAid/125783/C/SER/MULTI) Roundabouts - the safer intersection solution Overview about the presentation Types of Traffic dimensioning of Road safety aspects of by Lutz Pfeiffer Road Safety Audit Expert Consortium: WYG Engineering as Leading Partner TRADEMCO S.A. VIENNA Consult TRL Ltd Effects on pedestrian and Example for multilane roundabout 1. Types of Roundabouts are the most safety intersection type. Pre-conditions are a correct planning and building construction including the road marking and signage. 1. Types of Small Roundabout: Single-Lane-Circle (35 45 m diameter) Example for a 2-Lane-Roundabout 1. Types of Mini Roundabout: Single-Lane-Circle (13 22 m diameter) 1. Types of Roundabout: Two-Lane-Traffic ability (40 60 m diameter) 1
2 1. Types of Large Roundabout: Multi-Lane-Circle (more then 60 m diameter) Choice of the intersection type according to capacity Choice of the roundabout type according to capacity inside inhabited areas Choice of the roundabout type according to capacity outside inhabited areas Example for acceptable limit of unbalanced distribution of traffic intensity Example for roundabout with bypass to increase the capacity for one direction 2
3 Rule No. 1: The circle traffic has the right of way! Example for roundabout for normal capacity Source: Eptisa-Consitrans-Sweroad Safe junctions comparision of junction-geometries on interurban roads - German statistics about the accident cost rates Roundabout! Traffic ligth-2phases Traffic ligth-3phases Junction with stationary speed monitoring source: GDV Conflicts on a roundabout (8) in comparison to an intersection (32) Roundabout has a low number of conflict points: in particular no multiple conflicts in particular no crossing conflicts in particular no left-turning t conflicts Roundabout is good readily identifiable: Source: PIARC Source: Kreiselrichtlinie Kanton Zürich Source: GDV 3
4 Roundabout is good understandable: Accidents at Source:ADAC only easy decision making for drivers good visibility conditions for road users low level of speed of vehicles low difference of speed level between all road users low level of speed of vehicles, because the deflection of straight ahead traffic is double width of lane at min. Typical run of speed in area of a roundabout (Source: Merkblatt Kreisverkehr Germany FGSV 2006) Deviation of straight ahead traffic due to roundabout island (Source: Merkblatt Kreisverkehr Germany FGSV 2006) Design principles: dynamic roundabout vs. German solution Typ Minikreisverkehr Kreisver- Kreisver- proposed radii for Kleiner Kleiner kehr kehr mit zweistreifigen Zufahrten in- and outgoing traffic innerhalb Zufahrt RZ bebauter Gebiete Ausfahrt RA außerhalb Zufahrt RZ bebauter Gebiete Ausfahrt RA 4
5 Check of traffic ability by help of dynamic minimum turning curve Safekeeping of traffic ability by pave areas (for example cobble) outside of carriageway Check of traffic ability () Safekeeping of traffic ability () Signage for inside inhabited areas: Signage for outside inhabited areas: Sign no (German Traffic Rules) Here right - shows in drive direction on the circle lane Sign no (German Traffic Rules) hatched signboard - shows in drive direction on the circle lane Sign no. 205 (German Traffic Rules) yield sign and Sign no. 215 (German Traffic Rules) roundabout Sign no. 205 (German Traffic Rules) yield sign and Sign no. 215 (German Traffic Rules) roundabout Sign no (German Traffic Rules) arrowheaddirection-sign shows the outgoing way with the main direction Sign no (German Traffic Rules) to keep to the right - shows in drive direction on the right lane Sign no (German Traffic Rules) to keep to the right - shows in drive direction on the right lane Sign no (German Traffic Rules) hatched signboard Sign no. 438 (German Traffic Rules) pre-direction-sign shows the roundabout with the main directions Sign no. 438 (German Traffic Rules) pre-direction-sign shows the roundabout with the main directions Sign no. 205 (German Traffic Rules) yield sign and Sign no. 307 (German Traffic Rules) end of main road Pedestrian and cycle way inside inhabited areas: Cycle way inside inhabited areas: Example for give-way-line for pedestrians and separate cycle way Example for cycle way on access road to roundabout 5
6 Cycle way outside inhabited areas: Roundabout with bypass Example for pedestrian and cycle way with right of way for all directions and for bypass Example for cycle way in 2-way-line without right of way Example for pedestrian and cycle way with right of way for all directions, not for bypass Multilane roundabout Multilane roundabout Example for a multilane roundabout See the yield sign on access lanes! Usually are with a diameter more than 30 m less safe! Source: PIARC Berlin Germany The so called Great Star, it works safe with additional traffic signals Thank you for your attention! Any Questions? 6
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SCHEDULES OF TRAFFIC CALMING IN THE CZECH REPUBLIC Zdeněk Hrubý, Eva Simonová CDV Transport Research Centre Czech Republic e-mail: hruby@cdv.cz or simonova@cdv.cz REDESIGN OF TROUGHPASS OF HIGHWAY I/17