They are wider than a pickup truck, taller than a man, and strong enough to deflect the explosion of a car bomb.
In nearby Karbala, a car bomb detonated near a police station, killing three and wounding 20 others.
Furthermore, by removing them from their post, you create an opportunity for insurgent black magic to materialize a car bomb.
Last Friday, eight people were killed and scores more injured by a car bomb so powerful that it devastated an entire city block.
In the summer, two car bomb attacks on a Hezbollah suburb of Beirut that left dozens dead frayed nerves.
This was on July 16, after a car bomb exploded in Sadr City killing at least nine people and wounding dozens.
How many times can you go to a car bomb and see severed limbs?
In February, five refugees were killed when a car bomb went off near the camp.
During February 2007, Baghdad suffered an average of more than one car bomb attack a day.
Following the attack, a car bomb containing 50 kilos of explosives was discovered.