HARRISBURG — Pennsylvania has at least 30 truss bridges like the one that collapsed in Minnesota, but Gov. Ed Rendell said Thursday he is not ordering any special inspections or other precautions before the cause of the tragedy is determined.

Rendell said he would order prompt inspections of the truss bridges if it turns out that structural problems caused the bridge to collapse on Wednesday, but noted that other factors, including construction work that was in progress, will also be considered by federal investigators.

"There's no way to prejudge it," the governor said in conference call with reporters.

Late Thursday, U.S. Transportation Secretary Mary Peters signed off on a Federal Highway Administration advisory urging state transportation departments to conduct inspections of bridges similar to the one that collapsed.

A Rendell spokesman said officials will take a close look at Peters' directive.

"We are going to review Secretary Peters' guidance and get to work to determine the correct course of action to ensure the safety of our bridges," Rendell spokesman Doug Rohanna said.

Of the 14,868 state-owned bridges in Pennsylvania that are longer than 20 feet, about one-quarter are considered structurally deficient. No other state has more or a larger percentage of major bridges in that category, according to a Pennsylvania Department of Transportation analysis of federal statistics compiled in December.

Only Texas, with more than 32,000 state-owned major bridges, and North Carolina, with nearly 17,000, had more than Pennsylvania as of the end of last year, according to PennDOT.

Structurally deficient bridges in Pennsylvania are inspected at least once a year — and more often for those in the worst shape. The other bridges are inspected every other year, Rendell said.

When bridges are judged to be unsafe, "we don't hesitate to close them," he said.

In 2005, a structurally deficient overpass collapsed onto Interstate 70 in Washington, Pa., injuring three people when their vehicle crashed into the fallen concrete. State transportation officials said the 60-ton girder broke at a point where it had been hit repeatedly by trucks that were too high to pass under it.