FORD 2014 Explorer v.3 - Manual (Page 261)

In this first example, the left sensor is only partially obstructed; zone
coverage is nearly maximized.
Zone coverage also decreases when parking at shallow angles. Here, the left
sensor is mostly obstructed; zone coverage on that side is severely limited.
260 Driving Aids
2014 Explorer (exp)
Owners Guide gf, 3rd Printing, September 2013
USA (fus)