IN THE AUTOMOTIVE SENSE OF THE TERM
Blind spots are areas outside of a vehicle that the driver is unable to see.
Blind spots can be caused by the window pillars, headrests, passengers, and other objects. These blind spots are relatively small close to the vehicle, but they cover larger areas further away. At even moderate distances, a blind spot caused by an A-pillar can obscure large objects such as cars and people.
Another type of vehicular blind spot exists in the space between the driver’s peripheral vision and the area reflected by the rear-view mirrors. This type of blind spot can swallow up entire vehicles, which is why it's so dangerous to change lanes without looking to the left or right.
How Can Technology Help Remove Blind Spots?
Mirrors can help remove blind spots behind a driver, but they typically leave large dead areas to both sides of a vehicle. The addition of a convex blind spot mirror can allow a driver to see objects that fall into that type of blind spot, but those images are distorted and can make it difficult to judge distances. It is also illegal to even install a blind spot mirror in some jurisdictions.
Blind spot detection systems that use a variety of sensors and cameras to provide a driver with information about objects that are outside his range of vision. Cameras can provide
views from either side of a vehicle that allow a driver to verify that his blind spot is clear, and rear-view cameras can be useful when backing up or parallel parking.
Other systems use sensors to detect the presence of objects like cars and people, and that information can be presented to the driver in a number of ways. Some blind spot detection systems are able to tell the difference between a large object like a car and a smaller objects like a person, and they will simply alert the driver that there is a car or pedestrian located in one of his blind spots.
Some systems will also display a simple warning in the corner of the rear-view mirror if there is a vehicle in the blind spot.