Detachable boots for our sedans

The cities across the world are getting crowded day by day. The city roads have become congested with people craving for more parking space. With the entry of big big sedans to India we are also bound to face this problem. The parking space in the cities is diminishing. However the parking lots in India are more suitable for small cars. And when these sedans acquire parking space, its boot extends on to the road. With these problems in mind can we not design a detachable boot, which can be clamped on when required. It so happens that everyday city traveling doesn't require a boot. Without these boots the cars would get much smaller and occupy less parking space. Now we have a car which has the luxuries of a premium class sedan and maneuverability of a small car. Even the efficiency of the car increases with the decrease in weight.