The critical part is that you need to compare apples to apples - in this case, the one second delay is from the point at which the car had a clear idea of there

The critical part is that you need to compare apples to apples - in this case, the one second delay is from the point at which the car had a clear idea of there being an obstacle in its path until it would have started to apply the brakes. If you want to compare this to humans, you also need to remove the sequence of time during which the human identifies the potential obstacle as relevant and subsequently as something he would crash into. Whether this time is shorter or longer for humans is another question entirely (though the human intelligences' ability to deduce intent from behavior and forecast actions of other humans in traffic should give robocars a good challenge in that department as well). But in terms of raw reaction time after determining "I have to brake NOW", a human is definitely faster than one second.