Ford 2010 Milan Owner's Manual page 222

Driving
The Cross Traffic Alert system detects vehicles approaching up to 45 feet
(14 meters) away (approximately the width of five parking spaces).
Coverage decreases when vehicles and objects in close proximity block
the Cross Traffic Alert sensors (refer to figure for approximate zone
coverage areas [sensor obstructed to vehicle on left]). Backing
slowly from the parking spot in these situations helps to increase the
sensor coverage and effectiveness.
222
2010 Milan (mln)
Owners Guide, 1st Printing
USA (fus)