If you've ever owned a car financed by a dealer, then you know how it can be easy to miss a payment. Fortunately, there are some car dealerships that install kill switches on cars financed by them to keep people from defaulting.A kill switch (also known as a starter interrupt device or SID) is installed on a vehicle so that when a borrower misses payments, the car will be remotely shut off and can't start again. Some states have enacted laws that restrict the use of kill switches by lenders and require disclosure before they're placed on a car.Some of these devices are sold for less than $50 each. But many subprime auto lenders across the country have used them to help make sure their borrowers make their payments, and some consumer advocates are criticizing them.There are only five states that have laws that regulate the use of kill switches. In New York, Nevada and Colorado, for example, they must be disclosed in writing by certified mail before the devices are placed on a car.These laws also give borrowers the option of making extra payments that will get their cars started again. In most states, they can also get an emergency override code that can be sent to them if there's a problem with the device or they need their vehicle back urgently.If you're a business owner that owns heavy equipment like excavators, bulldozers and backhoes, consider installing a GPS tracker with a kill switch so that you can easily monitor the company vehicle. This real time tracking technology can help you prevent theft and ensure that your company vehicles aren't being used without authorization by catching employees stealing company time or activating the machines when they shouldn't be.