Bicycles more dangerous than terrorism?

The higher than expected number of casualties is attributed to a change in peoples' behaviour. What caused that change? Whilst it may have been a number of factors, the article and the research paper both attribute the change to terrorism. Whether the casualties are a primary or secondary effect of the initial terrorist act, we still need to consider the root cause.

I agree with you here (as does the Telegraph and the original study).

"7/7 London bombings may have resulted in '*second wave*' of casualties on the roads"