There are a number of reasons why police officers may need to touch your car when you are pulled over. One possible reason is that they are looking for illegal drugs or other contraband, which can be hidden in vehicles or used by criminals to transport stolen goods or commit other crimes. In addition, police officers may use their hands to check for any suspicious activity, such as someone trying to hide in the trunk of your car or escape through an unlocked door.
Another factor that can influence police car usage is local law enforcement needs and budget constraints. For example, some police forces may prioritize patrolling busy city streets or high-crime areas over using specialized vehicles like motorcycles or ATVs. Ultimately, the goal of police cars is to help keep  communities safe and secure, no matter what challenges they may face. So the next time you see a police car in your neighborhood, remember to thank the officers who are working hard to keep you and your community safe.