Motor Vehicles Real Intersection Design - PowerPoint PPT Presentation

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Motor Vehicles Real Intersection Design

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Motor Vehicles Real Intersection Design – PowerPoint PPT presentation

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Title: Motor Vehicles Real Intersection Design


1
Motor VehiclesReal Intersection Design
2
Outline
  • Sight distance
  • Design vehicle
  • Alignment profile
  • Lanes
  • Bike-Ped conflictspoints
  • Good Design is

3
SIGHT DISTANCE A drivers ability to see ahead
is of the utmost importance in the safe and
efficient operation of a vehicle on a highway.
4
Crest Vertical Sight Distance
5
Intersection Sight Distance
6
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Locate XW in Sight Triangle
13
Design Vehicle
  • Identify design vehicle for each turn
  • Multiple design vehicles per turn?
  • Speed v. Turns

14
Multiple Design Vehicles
WB-50 Semi
15
Design Vehicle Table
16
Speed v. Turns
WB-50
27 mph
R v2 / 15(ef)94
17
Alignment Profile
  • Right angles safer than skewed intersections
  • 90o Desirable
  • 65o Acceptable
  • Avoid lt 60o


18
Lanes
  • 10 12 ft
  • Avoid road space that has no clearly defined
    function
  • Match approach and departure lane
  • Avoid urban recovery lanes
  • Avoid through left turn lanes
  • Guide drivers clearly


19
Sea of Asphalt
20
Large, Tight Intersection
21
Recovery Lanes
22
Through Left Turns
23
Bike-Ped Conflicts Points
24
Good Design is
  • Self-evident
  • Self-explaining
  • Self-enforcing

25
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Credits
  • William Anderson, Vollmer Associates, NJ,
    wanderso_at_vollmer.com
  • Michael Moule, Livable Streets, Tampa FL,
    moule_at_livablestreetsinc.com
  • Michael Russo, New Jersey DOT, Mike.Russo_at_dot.stat
    e.nj.us
  • Michael King, Traffic Calmer, Brooklyn NY,
    miking_at_trafficcalmer.com
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