You have discussed about self -driving cars. In fact, you have mentioned that big companies would make this. Also, you have said that self-driving cars have their own manuals to operate. Furthermore, you have said that many countries should think about the rules to keep them. These are your thoughts. On the other hand, do you think that self driving cars be released soon in the market? Why are self-driving cars necessary in our modern lives? When these are available, how many cars would you buy? What do you think are the consequences of having these cars? Should people worry about them or they are even relieved? In all, your essay is good. I hope that my questions had helped you. Good luck!