Section B: Analytical Aspects Of Practice Flashcards
What term describes traffic volumes? It is the total annual volume of traffic divided by 365
Average Daily Traffic (ADT)
What is Design Hourly Volume (DHV)?
Volume of traffic tolerable by the driver (15% of ADT)
The maximum traffic in an hour is called
Peak Hourly Volume (PHV)
This roadway system is the most rapid and largest volume through-traffic system across and between urban areas. Best characterized by its limited access and grade separated intersections, (includes expressways and parkways)
Freeway
This roadway system is a through traffic system across and between urban areas. Allows direct access to adjacent properties but is characterized by control of entrances, exits, and curb use
Major Arterial
This road classification provides for movement of traffic between major arterials and local streets with direct access to adjacent properties. Traffic control is usually provided by signals and stop signs on side streets.
Collector street
This roadway classification provides for local traffic movement with direct access to adjacent properties and traffic control with stop signs
Local street
List the roadway classifications from largest to smallest
Freeway (60’+), major arterial (30’-40’), collector (30’), local (20’)
Aside from knowing traffic volumes and types of vehicles expected on the road, these 6 types of characteristics help you determine the location
- Present and proposed land uses
- Present and proposed circulation routes
- Topography
- Scenic opportunities
- Safety
- Respond to natural forces and features by respecting existing landscape
The length of road clearly visible to the driver is called
Sight distance
Site distance is based on _______________ of am average driver seated I’m the passenger car being 3’-9” above the road surface
Eye height
Safe site distance is a combination of these two factors
- Perception/ reaction
- Braking distance
The basic formula to calculate perception/ reaction distance is
Reaction time (2.5 seconds) x speed in MPH
The basic formula for calculating breaking distance is
Speed in MPH ^2 / (30 x coefficient of friction between tires and pavement)
How much square feet per car should you estimate for parking lot design?
325 (stalls, isles, lighting and landscape)
For residential multi-family parking is often placed on the ________ perimeter
Outer (inner location for pedestrian and open space)
What is the maximum distance a person will park to walk to their car?
200’
What is the maximum distance for people to park relative to commercial sites?
300’
What range of miles of bicyclists typically travel?
3-6 miles
Lengthy grades of _____% or more should be avoided in designing bike paths
5%
What is the preferred surfacing for bicyclists?
Asphalt
What is the maximum cross slope to use for drainage?
2%
T or F: catch basins are best located off the actual path of travel for cyclists along its grates being of a design that doesn’t entrap a bicycle tire
True
What’s the average dimensions for a bike?
6’ x 1.5’ x 2.5’
What’s the average spatial requirement for a single pedestrian?
24” wide
The average person walks a 20 min mile or _____ft per minute
260
Grades up to ____%/generally do not affect speed
6%