Areas of the surrounding space that the parking sensors scan during operation.
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Back only. Actually, the ability to scan the space behind the car is found in absolutely all parking sensors, but most often this direction is the only one provided for in the design. After all, forward visibility is usually good enough not to cause problems for most drivers, and the main source of difficulty is precisely the observation of obstacles behind the car.
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Front and back. The ability to track objects both behind and in front of the car. Parking sensors with a similar coverage are designed for those who want to have maximum safety guarantees when manoeuvring. After all, despite the fact that forward visibility is usually much better than backward, low obstacles can still go unnoticed; this is especially true with a high seating position of the driver, for example, in SUVs. Also, forward scanning is useful for novice drivers, as well as for those who need to get used to a new car after using another car with significantly different dimensions. However such parking sensors are usually somewhat more expensive than “purely rear” ones.
The number of front sensors that are standardly supplied with the parking sensors. For the meaning of the quantity in general, see "Rear sensors". Also note here that, since forward visibility is usually much better than backward, there are often only two front sensors — to cover the most problematic viewing areas (and not the entire forward direction). However, there are also "full-format" options for 4 sensors.
