NETTCP Environmental Impact & Sustainability in Transportation 4 — Questions and Answers
Question 1: What is the primary function of a wildlife crossing (ecopassage) installed beneath a highway?
- To allow maintenance crews safe access under high-traffic roads
- To reconnect fragmented habitat and reduce wildlife-vehicle collisions (Correct answer)
- To carry stormwater drainage beneath the roadway
- To provide underground utility corridors for fiber optic cables
Correct answer: To reconnect fragmented habitat and reduce wildlife-vehicle collisions
Wildlife crossings restore habitat connectivity fragmented by roads, enabling animal movement for foraging, breeding, and migration while reducing dangerous road crossings.
Question 2: Under the Clean Water Act Section 404, which federal agency must issue a permit before filling wetlands for a highway project?
- Federal Highway Administration (FHWA)
- U.S. Army Corps of Engineers (Correct answer)
- Environmental Protection Agency (EPA)
- U.S. Fish and Wildlife Service
Correct answer: U.S. Army Corps of Engineers
The U.S. Army Corps of Engineers administers Section 404 permits, which regulate the discharge of dredged or fill material into waters of the United States including wetlands.
Question 3: What does a Transportation Demand Management (TDM) program aim to reduce?
- The cost of highway construction materials
- Single-occupancy vehicle trips through incentives for alternative travel modes (Correct answer)
- The number of traffic signals along arterial corridors
- Maintenance costs for aging bridge infrastructure
Correct answer: Single-occupancy vehicle trips through incentives for alternative travel modes
TDM programs use strategies like carpooling incentives, transit subsidies, and flexible work schedules to shift travelers from single-occupancy vehicles, reducing emissions and congestion.
Question 4: Which pavement technology reduces tire-pavement noise and can decrease highway noise pollution for nearby residents?
- Portland cement concrete with exposed aggregate finish
- Open-graded friction course (OGFC) or porous asphalt (Correct answer)
- Thick-lift asphalt with smooth roller finish
- Chip seal surface treatment
Correct answer: Open-graded friction course (OGFC) or porous asphalt
OGFC and porous asphalt contain air voids that absorb tire noise energy, reducing traffic noise by 3-5 decibels compared to dense-graded conventional pavements.
Question 5: What environmental concern is associated with in-situ stabilization of contaminated soils discovered during highway construction?
- Creating permanent habitat loss for soil microorganisms
- Potential for worker exposure to hazardous materials and spread of contamination (Correct answer)
- Exceeding carbon emission limits for construction equipment
- Increasing road salt runoff during winter operations
Correct answer: Potential for worker exposure to hazardous materials and spread of contamination
Disturbing contaminated soils during construction can expose workers to hazardous substances and spread contamination through air, water, or equipment tracking if not properly managed.
Question 6: How does electrification of public transit fleets (e.g., electric buses) contribute to transportation sustainability goals?
- It eliminates all energy consumption associated with transit operations
- It shifts emissions from tailpipes to power plants, reducing local air pollution and enabling grid decarbonization benefits (Correct answer)
- It reduces the need for bus stops and transit shelters
- It eliminates the maintenance requirements for transit vehicles
Correct answer: It shifts emissions from tailpipes to power plants, reducing local air pollution and enabling grid decarbonization benefits
Electric buses produce zero direct emissions, improving local air quality, and as the electricity grid uses more renewables, lifecycle emissions decrease further over time.
Question 7: What is the significance of a 'Section 4(f) resource' in transportation project planning?
- A funding category for environmental mitigation projects
- A protected public park, wildlife refuge, or historic site that transportation projects cannot use unless no prudent alternative exists (Correct answer)
- A technical standard for stormwater management design
- A noise barrier design specification for residential areas
Correct answer: A protected public park, wildlife refuge, or historic site that transportation projects cannot use unless no prudent alternative exists
Section 4(f) of the Department of Transportation Act protects publicly owned parks, recreational lands, wildlife refuges, and historic sites from transportation project impacts unless there is no feasible and prudent alternative.
NETTCP Environmental Impact & Sustainability in Transportation 4
What is the primary function of a wildlife crossing (ecopassage) installed beneath a highway?