and react faster than before. The Expedition is available with selectable automatic full-time four-wheel drive that routes torque through a two-speed dual range transfer case with electronic locking center multi-disc differential. A new electronic locking rear differential is available to augment the 4x4 system. Both the center and rear locking systems are teamed with four-wheel electronic traction control (ETC), which simulates a locking front differential by ABS "brake locking" the front differential. The Expedition's off-road electronic aids Hill Descent Control (HDC) and Hill Ascent Assist (HAA) are joined by the Terrain Management System adapted from the Ford Raptor. Terrain Management is capable of working with 4L mode, like the Ford Raptor, and has seven drive modes to choose from which include Normal, Eco, Sport, Tow/Haul, Gravel/Snow, Mud/Ruts, and Sand. The four-wheel drive system has three direct drive modes which include 2H, 4A, and 4L. The 4H mode has been dropped from the selection, as the Terrain Management computer now controls the electronic center lock of the four-wheel drive system. Terrain Management engages the electronic center lock for a 50:50 front:rear torque split while in 4A direct drive mode, when the Mud/Ruts or Sand modes are selected. The 4L direct drive mode engages the electronic center lock regardless of the off-road drive mode selected. A "tap to lock/unlock" button is located near the drive mode dial for operation of the electronic rear lock. Off-road geometry figures for approach, departure, and ramp breakover, improve slightly with 23.3°, 21.9°, and 21.4° of obstacle clearance. Minimum running (lowest point) ground clearance increases by a full inch, from . The Expedition is certified by the Society of Automotive Engineers' independent SAE J2807 towing standard to tow a maximum of braked trailer. The tow rating increases by over the previous generation. Expedition will also feature Pro Trailer Backup Assist, a semi-autonomous system that allows the Expedition to reverse itself with a trailer coupled. The driver directs the system via a control dial, while the Expedition handles all steering and limits reversing speed. Among the new features that have been incorporated into the fourth generation Expedition are a 360-degree camera and park assist system, along with optional safety features that use both camera and radar technology, and include automatic braking, lane-keep assist, active cruise control, and blind-spot monitors. In addition, there are two USB ports per row, four 12-volt outlets and a 120-volt household outlet. Ford has