like early Cadillac Lyriqs with the initial door handle design or Teslas. In some newer BMWs with flush exterior door handles, you reach under the handle to hit a button to open the door ...

On Tuesday the NHTSA announced that these types of vehicles will now require a secondary latch to help prevent sliding doors from popping open in an accident and potentially expelling occupants.

The threshold, the sill of the door, provides support at the bottom of the doorway. Locking features for exterior doors include latch bolts, deadbolts, keyed locks, and security strike plates. Locks ...