interesting "alternative use" (Score 5, Insightful)

Disregarding the various arguments for and against the "congestion zone" and its implementation for the purposes of decreasing traffic... there's an interesting alternate purpose, apparently. This weekend's Observer describes the dual-use, not only to reduce congestion but also apparently to "protect the city from terrorist attack". Seems to me such a system generates way too much information to be able to "protect" in anything close to real-time.