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Signalization Principles. Intersections are a critical aspect of street design as the point where motorist, bicycle, and pedestrian movements converge. Successful intersection design addresses all mobility and safety goals as well as opportunities to enhance the public realm. This section explores intersection.
- Signalization Principles
Intersection Design Elements; Design Controls; Endorsement...
- Fixed Vs. Actuated Signalization
“Modeling the Effects of Pedestrians on Intersection...
- Leading Pedestrian Interval
A Leading Pedestrian Interval (LPI) typically gives...
- Corner Radii
Donnell, E. T., M. L. Adolini, D. J. Torbic, J. M. Mason,...
- Visibility/Sight Distance
Visibility can be achieved through a variety of design...
- Coordinated Signal Timing
Intersection Design Elements; Design Controls; Endorsement...
- Signalization Principles
Good intersection design can tap civic and economic potential, infusing overbuilt or underutilized spaces with street life. Intersection design should facilitate visibility and predictability for all users, creating an environment in which complex movements feel safe, easy, and intuitive.
- Self-Driving Vehicles
- Traffic Sensors
- Protected Bike Lanes
- Bike Rails
- Bike Signals
- Speed Tables
- Scrambles
- Parklets
- Trees
- Dedicated Shelters
Studded with sensors and humming with AI, autonomous cars could slash death rates at intersections while eliminating traffic signals altogether.
Induction loop sensors detect the metal bulk of a car and talk to signal lights. They’ve been in use since the ’60s and are crucial to traffic flow.
Expect to see more of these—the US Department of Transportation recently endorsed the design as a way to create “low-stress bicycle networks.”
Bike rails may be just a few metal tubes welded together, but for any cyclist who has waited on tiptoes for the light to change, they’re a welcome addition.
A light timed for cyclists gives them just a few seconds’ head start, but that’s enough to get up to speed before traffic roars to life.
Raising the crossing puts drivers at eye-height with pedestrians. “It makes it obvious that pedestrians rule,” says Steve Mouzon, an architect and urbanist.
By stopping all traffic at once, scramble crossings provide better separation of cars and people, allowing foot traffic to move in any direction—even diagonally—in relative safety.
By reclaiming street parking, parklets offer pedestrians a bit of respite that, when well designed, can feel like a swanky sidewalk café, Mouzon says.
“One thing traffic engineers try to get rid of as quickly as possible is street trees,” Mouzon says. Bad idea. For a walkable street on a hot day, the more trees, the better.
On many bus routes, shelters protect waiting riders from the elements. Boarding goes faster if fares are collected on the street, not on the bus.
at-grade intersection design. The course objective is to give engineers and designers an in-depthlook at the principles to be considered whenselecting and designing intersections. Subjects include: 1. General design considerations – function, objectives, capacity 2. Alignment and profile 3. Sight distance – sight triangles, skew 4.
Intersections. For city streets to meet the needs and demands of everyone using them, intersections—both large and small—need to function as safely and efficiently as possible. Good intersection design, however, goes beyond making streets safer. Well-designed intersections use street space to bring people together and invigorate a city ...
Design safe infrastructure at intersections by starting with the needs of the most vulnerable users. Use existing pedestrian behaviors and desire lines to guide design. Provide safe and accessible sidewalks, crossings, and refuge areas for pedestrians, and dedicated facilities and protected intersections for cyclists.
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Oct 28, 2016 · 16 Ways to Design a Better Intersection---And Better Cities. Urban designers have lots of tricks for turning a city intersection into something more like a plaza and less like a freeway interchange.
