Service animals are defined as dogs that are individually trained to do work or perform tasks for people with disabilities, although some state and local laws also define service animals more broadly. Examples of such work or tasks include guiding people who are blind, alerting people who are deaf, pulling a wheelchair, alerting and protecting a person who is having a seizure, or other duties. Some state and local laws also define service animals more broadly. State and local governments, businesses and nonprofit organizations that serve the public must allow service animals to accompany people with disabilities to all areas of the facility that the public is normally allowed to go.  

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As stated above, a service dog is allowed wherever the public would usually be allowed to go, which also applies to transportation. Checking with the driver should be done as a courtesy, explaining the role of the service animal.