The right to this land is granted to the railway company through mechanisms such as easement. Watercraft are generally allowed to navigate public waters without restriction as long as they do not cause a disturbance. Passing through a lock, however, may require paying a toll. Despite the common law tradition Cuius est solum, eius est usque ad coelum et ad inferos of owning all the air above ones property, the US Supreme Court ruled that aircraft in the US have the right to use air above someone elses property without their consent. While the same rule generally applies in all jurisdictions, some countries such as Cuba and Russia have taken advantage of air rights on a national level to earn money. There are some areas that aircraft are barred from overflying. This is called prohibited airspace. Prohibited airspace is usually strictly enforced due to potential damage from espionage or attack. In the case of Korean Air Lines Flight 007, the airliner entered prohibited airspace over Soviet territory and was shot down as it was leaving. Safety
For a comparison of transportation fatality rates, see: Air safety statistics. Several different metrics used to compare and evaluate the safety of different vehicles. The main three are deaths per billion passenger-journeys, deaths per billion passenger-hours and deaths per billion passenger-kilometers. See also

Automotive acronyms and abbreviations
ISIRI 6924
Narrow-track vehicle
Outline of vehicles
Personal transporter
Propulsion
Single-track vehicle
Vehicular dynamics
Vehicular metrics


== References ==
Differential diagnosis
The differential diagnosis for heel pain is extensive and includes pathological entities including, but not limited to, the following: calcaneal stress fracture, septic arthritis, calcaneal bursitis, osteoarthritis, spinal stenosis involving the nerve roots of lumbar spinal nerve 5 (L5) or sacral spinal nerve 1 (S1), calcaneal fat pad syndrome, metastasized cancers from elsewhere in the body, hypothyroidism, gout, seronegative spondyloparthopathies such as reactive arthritis, ankylosing spondylitis, or rheumatoid arthritis (more likely if pain is present in both heels), plantar fascia rupture, and compression neuropathies such as tarsal tunnel syndrome or impingement of the medial calcaneal nerve.A determination about a diagnosis of plantar fasciitis can usually be made based on a persons medical history and physical examination. When a physician suspects a fracture, infection, or some other serious underlying condition, they may order an X-ray to investigate. X-rays are unnecessary to screen for plantar fasciitis for people who stand or walk a lot at work unless imaging is otherwise indicated. Treatment
Non-surgical
About 90% of plantar fasciitis cases improve within six months with conservative treatment, and within a year regardless of treatment.The recommended first treatment is a 4-6 week course which combines three elements: daily stretching, daily foot taping (using a special tape around the foot for supporting the arch) and individually tailored education on choosing footwear and other ways of managing the condition.If plantar fasciitis fails to respond to conservative treatment for at least three months, then extracorporeal shockwave therapy (ESWT) may be considered.