As someone who used to run away from the police, it's generally easiest to get away from them by running on foot -- if your environment and circumstances doesn'

As someone who used to run away from the police, it's generally easiest to get away from them by running on foot -- if your environment and circumstances doesn't let you run away on foot then you'll rarely succeed getting away using another method. But I don't understand this policy. What constitutes "running"? Can someone just slowly walk away?