So Mexican Trucks Started Deliveries A Few Days Ago

From Arizona's KTAR on September 6

"The first of up to 150 Mexican trucks is ready to deliver cargo throughout the United States today.
Some say it will allow dangerous trucks driven by poor drivers to roll on American highways.
Others warn it could increase human and drug smuggling.
The Bush administration had planned on beginning a pilot program today, but folks like Arizona Congressman John Shadegg still have concerns.
"Obviously there are concerns about the safety of the trucks," Shadegg said."

September 10

"PIEDRAS NEGRAS, Mexico (AP) - A dynamite-laden truck exploded after colliding with another vehicle on a busy highway in northern Mexico's coal country, killing at least 34 people, including three reporters at the scene, state and federal officials said.
Authorities said the two vehicles crashed into each other Sunday evening, drawing a crowd of curious onlookers as well as a small army of police, soldiers, emergency officials and journalists.
Shortly after the crowd arrived, the wreckage caught fire, and the dynamite exploded, sending a ball of fire into the sky that consumed nearby cars and left a 10-by-40 foot crater in the concrete, said Maximo Alberto Neri Lopez, a federal police official."