Advocates in transportation law represent the interests of clients in legal matters related to transportation, such as disputes over contracts, accidents, and regulatory compliance.

Taxation is not typically an area of advocacy in transportation law, as it is primarily the responsibility of government agencies.

Transportation policymaking involves establishing goals and objectives for the transportation system, allocating resources for transportation projects, and regulating the transportation industry.

All of the above are primary stakeholders in transportation policymaking, as they all have a vested interest in the development and implementation of transportation policies.

Advocacy groups play a vital role in transportation policymaking by representing the interests of specific groups or causes, providing input on policies and regulations, and monitoring their implementation.

Transportation law aims to achieve multiple goals, including ensuring the safe and efficient movement of people and goods, protecting the environment, and promoting economic development.

Space law is not typically considered a type of transportation law, as it deals with legal issues related to space exploration and activities beyond Earth's atmosphere.

Transportation regulatory agencies are responsible for developing and enforcing regulations to ensure the safe and efficient operation of the transportation system.

Transportation planning involves identifying and addressing transportation needs, developing strategies for improving the transportation system, and coordinating transportation projects with other land use planning efforts.

All of the options listed are common modes of transportation.

Sustainable transportation aims to achieve multiple goals, including reducing the environmental impact of transportation, improving its safety and efficiency, and promoting economic development.

All of the options listed are common types of transportation infrastructure.

Transportation engineers are responsible for designing and constructing transportation infrastructure, such as roads, bridges, and airports.

Hyperloop is a futuristic transportation technology that is still in the early stages of development and is not yet widely used.

Transportation safety aims to achieve multiple goals, including reducing the number of accidents and fatalities, improving the safety of infrastructure, and educating the public about transportation safety.