One of the first lessons Hermione learned when she was on the run was that Muggles were often entirely too trusting. Even in the large cities she sometimes took refuge in she could easily find a car that had been left unlocked. Sometimes it took a few tries to uncover one. Especially if she'd wandered into a nicer neighborhood where all of the cars were likely to have alarms. More than a few times she'd been forced to run as quickly as she could into the shadows of the night to keep out of the clutches of the Muggle authorities.