or V2I communication). Modern cars have ADAS integrated into their electronics; manufacturers can add these new features. ADAS are considered real-time systems since they react quickly to multiple inputs and prioritize the incoming information to prevent crashes. The systems use preemptive priority scheduling to organize which task needs to be done first. The incorrect assignment of these priorities is what can cause more harm than good. ADAS levels ADAS are categorized into different levels based on the amount of automation, and the scale provided by The Society of Automotive Engineers (SAE). ADAS can be divided into six levels. In level 0, ADAS cannot control the car and can only provide information for the driver to interpret on their own. Some ADAS that are considered level 0 are: parking sensors, surround-view, traffic sign recognition, lane departure warning, night vision, blind spot information system, rear-cross traffic alert, and forward-collision warning. Level 1 and 2 are very similar in that they both have the driver do most of the decision making. The difference is level 1 can take control over one functionality and level 2 can take control over multiple to aid the driver. ADAS that are considered level 1 are: adaptive cruise control, emergency brake assist, automatic emergency brake assist, lane-keeping, and lane centering. ADAS that are considered level 2 are: highway assist, autonomous obstacle avoidance, and autonomous parking. From level 3 to 5, the amount of control the vehicle has increases; level 5 being where the vehicle is fully autonomous. Some of these systems have not yet been fully embedded in commercial vehicles. For instance, highway chauffeur is a Level 3 system, and automated valet parking is a level 4 system, both of which are not in full commercial use in 2019. The levels can be roughly understood as Level 0 - no automation; Level 1 - hands on/shared control; Level 2 - hands off; Level 3 - eyes off; Level 4 - mind off, and Level 5 - steering wheel optional. Feature examples This list is not a comprehensive list of all of the ADAS. Instead, it provides information on critical examples of ADAS that have progressed and become more commonly available since 2015. === Alerts and warnings === Alcohol ignition interlock devices do not allow drivers to start the car if the breath alcohol level is above a pre-described amount. The Automotive Coalition for Traffic Safety and the National