Story: Overpass Collapse Becomes Lesson in Construction, 5/10/07
http://www.pbs.org/newshour/bb/science/jan-june07/overpass_05-10.html

Worksheet Questions:

1. What caused the California freeway highway overpass to collapse?

2. What temperature did professor Abolhassan Astaneh estimate that the fire reached? What did that do to the steel girders supporting the overpass?

3. Name two changes that Astaneh suggests would improve highway construction safety.

4. Who is paying to repair the overpass? How much will it cost?

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