[mezzman]

However hazardous cargo is not allowed in tunnels so bridges like this one are the only way hazmat can be transported over water crossings.

[maxerickson]

On the news this morning a commentator made it sound like that rule was imposed after 9/11.

It makes sense to me that cargo would be restricted, and it's bizarre that it would be related to terrorism (an additional rule isn't going to prevent an attack...).

[throwaway48476]

It's still a sensible rule. As we see with this incident rare events do happen.