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Challenges include engine noise, tire noise on the pavement, and aerodynamic noise. Solutions include improved insulation, better aerodynamic design, and quieter tires.

Challenges include engine noise for gas-powered scooters and road noise exposure for the riders. Solutions include electric scooters for noise reduction and the use of helmets to protect riders from ambient noise.

Challenges include rotor noise and mechanical noise from engines. Solutions involve the use of noise-reducing rotor blades and quieter engine technologies.

Challenges include aerodynamic noise at high speeds, particularly from pantographs and tunnel boom effects. Solutions include streamlined train designs, sound barriers along tracks, and tunnel modifications.

Challenges include wheel-rail noise, electrical system noise, and screeching on curves. Solutions involve implementing rail dampers, friction modifiers on tracks, and better electrical insulation.

Challenges are negligible in terms of noise production but include noise exposure to cyclists in urban environments. Solutions involve urban planning for bike-friendly routes away from heavy traffic.

Challenges include engine noise, noise from air conditioning systems, and passenger noise. Solutions revolve around better engine design, soundproofing, and designated quiet zones.

Challenges include engine noise, cavitation noise from propellers, and hydrodynamic noise. Solutions entail hull design improvements, cavitation prevention techniques, and machinery isolation.

Challenges include electric motor noise and vibration noise on uneven surfaces. Solutions focus on motor noise reduction, vibration damping materials, and ensuring smooth operation surfaces.

Challenges include wheel-rail noise and vibrations, horn noise, and aerodynamic noise for high-speed trains. Solutions involve using noise barriers, vibration damping technology, and design improvements.

Challenges include engine noise, exhaust noise, and wind noise at high speeds. Solutions include the use of quieter engines, improved exhaust systems, and aerodynamic designs to reduce wind noise.

Challenges include launch noise and re-entry noise, posing risks to both the crew and structures. Solutions involve remote launch sites, noise reduction measures on launch pads, and sound suppression water systems.

Challenges include engine noise and sonic booms. Solutions involve using quieter engine designs and implementing noise-abatement procedures during takeoff and landing.

Challenges include engine noise, aerodynamic noise from large bodies, and tire noise. Solutions entail acoustic treatment of the cab, aerodynamic enhancements, and the use of quiet tires.

Challenges include noise from tracks and vibrations, braking systems, and crowded stations. Solutions focus on track maintenance, low-noise braking systems, and sound absorption materials in stations.

Challenges include pedestrian safety due to quietness, and high-frequency electrical noise. Solutions encompass artificial noise generators for pedestrian safety and shielding/routing of electrical components.

Challenges are minimal but can include wind noise and noise from equipment. Solutions involve using design techniques to minimize fluttering and noise from rigging, and educating sailors on noise management.