Answer
The photo was likely taken on a warm day.
Work Step by Step
On a cold day, there would be more space between the expansion joints.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 15 - Think and Explain - Page 299-300: 81
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