CENE 420 Exam - Study Guide Exam

CENE 420 Exam - Study Guide Exam Questions and Answers Explain the difference between a policy and a standard in relation to traffic signal timing and operations, provide an example of each - Correct Answers ✅Policy is a stated goal from the community's vision in how things should be

(Example: Improve bike operations)

Standard is a common practice; agreed repeatable way of

doing things (Example: MUTCD, ADOT)

Explain how to interpret the meaning of Peak Hour Factor (PHF) value. Explain what the value means on both ends of the scale, as well as how it relates to capacity - Correct Answers ✅PHF relates how large the flow peaks across on hour 0.25 = large peak 1.00 = constant, consistent flow Facilities at capacity are near 1.00, but 1.00 doesn't indicate capacity by itself Explain the difference between an Interrupted and an Uninterrupted facility - Correct Answers ✅Interrupted Facility - Fixed external interruptions (e.g. traffic signals, unsignalized intersections, stop/yield signs, driveways, parking maneuvers) 1 / 4

CENE 420 Exam - Study Guide Exam Questions and Answers Uninterrupted Facility - Freeway, Rural Highway List 4 characteristics of an intersection that would be of interest to a traffic engineer performing a critical analysis of the intersection - Correct Answers ✅- Flow Rates

• Geometry/Striping
• TCD devices
• Cabinet

Define "Retroreflectivity" and explain how it works - Correct Answers ✅Retroreflectivity reflects light back to source

(Example: sheeting or prisms)

List and define the 4 different MUTCD headings - Correct

Answers ✅Standard: Mandatory

Guidance: Recommended

Option: No recommendation

Support: Informational

Name the microscopic traffic stream parameter that relates mathematically to density - Correct Answers ✅Space Headway 2 / 4

CENE 420 Exam - Study Guide Exam Questions and Answers Name the microscopic traffic stream parameter that relates mathematically to volume - Correct Answers ✅Time Headway What is Operational Objective? - Correct Answers ✅Principle that guides operational choices; Who is our

priority? (Example: Bike phase, bike signal, cycle track)

Using the example of a pedestrian crossing at a signalized intersection, explain the tradeoff in traffic engineering between efficiency and safety - Correct Answers ✅Safety and Efficiency are at odds with each other, but safety is more important; at times, we sacrifice efficiency for safety What is Safety and Efficiency? - Correct Answers ✅Safety - reducing collisions (fatals, injury, property damage) Efficiency - not wasting a resource or time What is Perception-Reaction Time (P-R) and the 4 distinct steps of the process? - Correct Answers ✅Perception- Reaction Time = time from observing a stimulus to executing a reaction

Four steps:

• Detection 3 / 4

CENE 420 Exam - Study Guide Exam Questions and Answers

• Identification
• Decision
• Response

What are the 3 macroscopic traffic stream parameters? - Correct Answers ✅- Volume

• Speed
• Density

what is AADT? - Correct Answers ✅Average Annual Daily Traffic (Data for 1+ years) What is ADT? - Correct Answers ✅Average Daily Traffic (Data for less than 1 year) What is AAWT? - Correct Answers ✅Average Annual Weekday Traffic What is AWT? - Correct Answers ✅Average Weekday Traffic What is Volume (q, V)? - Correct Answers ✅- vehicles/day

• vehicles/hour
• may represent flow rate for a smaller period of time
• / 4