Transportation Systems Final Exam
ACTUAL UPDATED QUESTIONS AND
CORRECT ANSWERS
Federal Highways Designation - CORRECT ANSWERS✅✅All types of access control
Interstate Highways Designation - CORRECT ANSWERS✅✅Almost entirely access
controlled
State Highways Designation - CORRECT ANSWERS✅✅All types of access control
Freeway - CORRECT ANSWERS✅✅A divided highway with full control of access and
two or more travel lanes in each direction
-No direct interaction with crossing streets or other freeways
-Opposing traffic is separated by a raised barrier, an at-grade median, or a raised traffic island
-Outside the influence of ramps and weaving areas
Level of Service - CORRECT ANSWERS✅✅-Traditional measure of the "quality of
service" of a highway
-Does not include safety
-Different measures for different facilities
-Six grades (A through F)
-Freeway LOS is based entirely on traffic density
-Conveys how the density values are perceived by drivers and passengers when traveling int
eh traffic stream
Calculating Level of Service Basic Steps - CORRECT ANSWERS✅✅1. Calculate Free-
Flow Speed
2. Calculate Equivalent Flow Rate
3. Calculate Density and Determine LOS
,Free Flow Speed (FFS) - CORRECT ANSWERS✅✅Time mean speed of passenger cars at
low flow rates (<1,000 vph)
What does Free Flow Speed (FFS) depend on? - CORRECT ANSWERS✅✅-Lane width
-Lateral clearance
-Number of lanes
-Interchange density
-Geometric layout and grade
Functional Classification - CORRECT ANSWERS✅✅Based on stages of a highway trip
-Main movement
-Transition
-Distribution
-Collection
-Access/Termination
Principal arterials - CORRECT ANSWERS✅✅-Interstates
-Other Freeways
-High AADT
Minor arterials - CORRECT ANSWERS✅✅-Interconnect principal arterials with service to
collectors
-High AADT
Major/Minor collectors - CORRECT ANSWERS✅✅-Transition between arterials and locals
-Medium AADT
Local roads and streets - CORRECT ANSWERS✅✅-Access to destinations
-Low AADT
, Types of service being provided by Mobility - CORRECT ANSWERS✅✅Providing a route
to a region or a set of destinations
Types of service being provided by Access - CORRECT ANSWERS✅✅Providing access to
a specific destination
Functional classification allows us to ensure smooth transitions of: - CORRECT
ANSWERS✅✅-Speed (high to low)
-Capacity (high to low)
-Access (low to high)
Functional classification allows us to resolve problems with: - CORRECT ANSWERS✅✅-
Congestion/delay
-Safety
Design Hourly Volume (DHV) - CORRECT ANSWERS✅✅A projected hourly volume of
traffic that the roadway should be designed for
-Not the max hourly volume on the roadway
-Not the average hourly volume on the roadway
-Taken as a percentage of the AADT
-Depends on the fluctuation of the AADT throughout a typical day
Design Speed - CORRECT ANSWERS✅✅A speed selected to optimize the design of
geometric features of the roadway-the maximum safe speed that can be maintained in
conditions good enough for the geometric features of the roadway to govern
-Higher design speeds will lead to higher capacity, higher possible flow rates, better LOS
-Lower design speeds will lead to improved safety outcomes
-Not the posted speed limit (almost always higher)
-Often taken to be the 85th percentile of observed operating speeds (drivers expected speed)
-Normally around 70mph is the goal for freeways
-Primarily governs the design of curvature and sight distance
ACTUAL UPDATED QUESTIONS AND
CORRECT ANSWERS
Federal Highways Designation - CORRECT ANSWERS✅✅All types of access control
Interstate Highways Designation - CORRECT ANSWERS✅✅Almost entirely access
controlled
State Highways Designation - CORRECT ANSWERS✅✅All types of access control
Freeway - CORRECT ANSWERS✅✅A divided highway with full control of access and
two or more travel lanes in each direction
-No direct interaction with crossing streets or other freeways
-Opposing traffic is separated by a raised barrier, an at-grade median, or a raised traffic island
-Outside the influence of ramps and weaving areas
Level of Service - CORRECT ANSWERS✅✅-Traditional measure of the "quality of
service" of a highway
-Does not include safety
-Different measures for different facilities
-Six grades (A through F)
-Freeway LOS is based entirely on traffic density
-Conveys how the density values are perceived by drivers and passengers when traveling int
eh traffic stream
Calculating Level of Service Basic Steps - CORRECT ANSWERS✅✅1. Calculate Free-
Flow Speed
2. Calculate Equivalent Flow Rate
3. Calculate Density and Determine LOS
,Free Flow Speed (FFS) - CORRECT ANSWERS✅✅Time mean speed of passenger cars at
low flow rates (<1,000 vph)
What does Free Flow Speed (FFS) depend on? - CORRECT ANSWERS✅✅-Lane width
-Lateral clearance
-Number of lanes
-Interchange density
-Geometric layout and grade
Functional Classification - CORRECT ANSWERS✅✅Based on stages of a highway trip
-Main movement
-Transition
-Distribution
-Collection
-Access/Termination
Principal arterials - CORRECT ANSWERS✅✅-Interstates
-Other Freeways
-High AADT
Minor arterials - CORRECT ANSWERS✅✅-Interconnect principal arterials with service to
collectors
-High AADT
Major/Minor collectors - CORRECT ANSWERS✅✅-Transition between arterials and locals
-Medium AADT
Local roads and streets - CORRECT ANSWERS✅✅-Access to destinations
-Low AADT
, Types of service being provided by Mobility - CORRECT ANSWERS✅✅Providing a route
to a region or a set of destinations
Types of service being provided by Access - CORRECT ANSWERS✅✅Providing access to
a specific destination
Functional classification allows us to ensure smooth transitions of: - CORRECT
ANSWERS✅✅-Speed (high to low)
-Capacity (high to low)
-Access (low to high)
Functional classification allows us to resolve problems with: - CORRECT ANSWERS✅✅-
Congestion/delay
-Safety
Design Hourly Volume (DHV) - CORRECT ANSWERS✅✅A projected hourly volume of
traffic that the roadway should be designed for
-Not the max hourly volume on the roadway
-Not the average hourly volume on the roadway
-Taken as a percentage of the AADT
-Depends on the fluctuation of the AADT throughout a typical day
Design Speed - CORRECT ANSWERS✅✅A speed selected to optimize the design of
geometric features of the roadway-the maximum safe speed that can be maintained in
conditions good enough for the geometric features of the roadway to govern
-Higher design speeds will lead to higher capacity, higher possible flow rates, better LOS
-Lower design speeds will lead to improved safety outcomes
-Not the posted speed limit (almost always higher)
-Often taken to be the 85th percentile of observed operating speeds (drivers expected speed)
-Normally around 70mph is the goal for freeways
-Primarily governs the design of curvature and sight distance
