I always wondered what the real meaning of 'speed limit' is .. All those who drive in US know that one can drive upto 15 miles more than the actual 'speed limit'.. why the hassle of putting some number and making the driver to add 15 to it? Wouldnt it be much better if the sign boards change to, say, 'Maximum speed 84' at the freeways? It is not like the IST (Saw in Srivatsan's page: Indian Stretchable Time). In a country like US where time, etc. are followed nicely, why not this speed?