These spikes are used in low speed areas like rental car returns to avoid people taking off with returned cars with keys in etc. Not at all advisable on regular roads, see this study done for the same.

But ,

Quote Originally Posted by rksingh1 View Post
What an irony - we have come to this stage where we need to install dangerous devices to stop people breaking the law
Wrong side driving has become so prevalent now, most cops not bothered at all. I had a scary experience last evening when taking a right at a signal only to see dozens of 2 wheelers pass me from my right from the other side of the divider. The cop hardly bothered...