Both the Mustang and M4 have rear cross-traffic warning, but the Mustang has Cross Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The M4’s Cross Traffic Warning doesn’t automatically brake.
Both the Mustang and the M4 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning and driver alert monitors.

