It is now qualified as a condition that could potentially compromise driver safety, therefore a driver may have to be evaluated by an authorized ophthalmologist to determine if they can drive safely. As of May 2008, there is an ongoing campaign to remove the legal restrictions that prohibit colorblind citizens from getting drivers licenses. In June 2020, India relaxed its ban on drivers licenses for the colorblind to now only apply to those with strong CVD. While previously restricted, those who test as mild or moderate can now pass the medical requirements. Australia instituted a tiered ban on the colorblind from obtaining commercial drivers licenses in 1994. This included a ban for all protans, and a stipulation that deutans must pass the Farnsworth Lantern. The stipulation on deutans was revoked in 1997 citing a lack of available test facilities, and the ban on protans was revoked in 2003. All colorblind individuals are banned from obtaining a drivers license in China and since 2016 in Russia (2012 for dichromats). There are several features available that help the colorblind compensate for their color vision deficiency:

British Rail signals use more easily identifiable colors: the red is blood red, the amber is yellow and the green is a bluish color. The relative position of traffic lights is fixed internationally as red, amber, green from top to bottom. Horizontal lights will differ depending on the country, but right hand traffic typically follows a "red light always on the left" pattern.
Causes
The causes of umbilical hernia are congenital and acquired malformation, but an apparent third cause is really a cause of a different type, a paraumbilical hernia. Congenital
Congenital umbilical hernia is a congenital malformation of the navel (umbilicus). Among adults, it is three times more common in women than in men; among children, the ratio is roughly equal. It is also found to be more common in children of African descent. Acquired
An acquired umbilical hernia directly results from increased intra-abdominal pressure caused by obesity, heavy lifting, a long history of coughing, or multiple pregnancies. Another type of acquired umbilical hernias are incisional hernias, which are hernia developing in a scar following abdominal surgery, e.g. after insertion of laparoscopy trocars through the umbilicus. Paraumbilical
Importantly, an umbilical hernia must be distinguished from a paraumbilical hernia, which occurs in adults and involves a defect in the midline near to  the umbilicus, and from omphalocele. Diagnosis
Navels with the umbilical tip protruding past the umbilical skin ("outies") are often mistaken for umbilical hernias, which are a completely different shape. Treatment for cosmetic purposes is not necessary, unless there are health concerns such as pain, discomfort or incarceration of the hernia content. Incarceration refers to the inability to reduce the hernia back into the abdominal cavity. Prolonged incarceration can lead to tissue ischemia (strangulation) and shock when untreated. Umbilical hernias are common. With a study involving Africans, 92% of children had protrusions, 49% of adults, and 90% of pregnant women.