Intersection Design
the separation of conflicting traffic movements into definite paths of travel by traffic islands of pavement markings.
channelization
the maximum hourly rate at which persons or vehicles can reasonably be expected to traverse a point or uniform section of a lane or roadway during a given time period under prevailing roadway, traffic and control conditions.
Capacity
denoted a "k", is the number of vehicles traveling over a unit length of highway at an instant in time.
density
This type of design alignment includes straight (tangent) of the roadway and the circular curves that connect their change in direction.
horizontal alignment
Color used for temporary construction markings both applicable for signs and pavement markings
orange
occurs where two paths interact or cross.
conflict points
qualitative description of how a certain facility is performing.
Level of service
the difference between the time the front of a vehicle arrives at a point on the highway and the time the front of the next vehicle arrives at that same point.
time headway
This type of design alignment includes straight (tangent) highway grades and the parabolic curves that connect these grades
vertical alignment
background color used for recreational type of traffic signs with main purpose for tourist and cultural sites
brown
a type of traffic circle that are usually greater than 300ft, with a minimum horizontal deflection of the path through the traffic
rotaries
The highest hourly volume within a 24 hour period
hourly volume
the arithmetic mean of the speeds of vehicles passing a point on a highway during an interval of time.
Time mean speed
This principal element of a highway cross section is always contiguous with the traveled lane to provide an area along the highway for vehicles to stop when necessary.
shoulders
These markings are often used to guide traffic into the right turning lanes separated by an island, such as a corner island at a signalized intersection.
Chevron Markings
A category of intersection which is commonly know as interchanges.
Grade-separated with ramps
The peak 15 minute flow enlarged to an hourly value, also known as design hourly volume. Provide formula
service flow. SF = V/V15
the harmonic mean of the speeds of vehicles passing a point on a highway during an interval time.
Space mean speed
This part of a road cross section is where the pavements on straight sections of two-lane and multilane highways without medians are sloped from the middle downward to both sides of the highway
cross slopes
Is a type of thermoplastic lane marking designed to aid and provide motorist with visual, audio, and motion warnings on the road.
rumble strips
How many merging and diverging points does a four-leg intersection has? (give 2 answers)
8 merging points and 8 diverging points
The ratio of the hourly volume to the peak 15 minute flow enlarged to an hourly value. Provide formula
Peak hour factor PHF = V/(V15 x 4)
the general equation relating flow, density, and space mean speed
q = k us (us = space mean speed)
This highway element is provided on the embankments and fills to provide stability for earthworks. They also serve as a safety feature by providing a recovery area for out of-control vehicles.
side slope
“No Parking” is a traffic sign classified under what type?
Regulatory