The QR code is a unique safety feature for Call a Ride users. All the Rider needs to do is scan the QR code on the sticker on your vehicle. This lets you and your Rider know that you have the correct Rider and vehicle for the ride. This protects the Driver and the Rider. So, if you want to keep your doors locked until the Rider scans the QR code and verifies they are the correct Rider, go for it. This provides additional safety for the Driver and prevents random people from jumping in your vehicle.