-
-
-
Ford installed seatbelts into car
-
Seatbelts became optional
-
Airbags were invented
-
Chrysler installs airbags in car
-
-
-
GM installs seatbelts into car
-
Traction Control became optional
-
Airbags became optional
-
-
-
Volvo installs Blind Spot Monitors into car
-
Blind Spot Monitors became optional