Update as of 2:30 p.m. Sunday: Endeavour has arrived at the California Science Center. Click here to read more.

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LOS ANGELES (CBSLA.com) — When it flew around up in space, Endeavour could go 17,500 mph.

On the ground in Los Angeles Saturday … we got that the shuttle had to move slowly. Two mph … tops, said officials.

But even with its slow speed winding and ambling through South LA streets, estimates had the shuttle running at least 10 hours behind schedule.

What gives? Why so slow? Why was the shuttle moving at far less than the speed of light. Some snails could have beaten Endeavour to the CSC.

CBS2 and KCAL9 Bobby Kaple went in search of answers.

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He reported that “the shuttle started out 30 minutes behind schedule.”

Then there were several maintenance issues on the road, he said.

After the maintenance issues, some trees got in the way and had to be trimmed of cut down.

Turning onto Martin Luther King Boulevard provided some old trees and new challenges as well. After officials decided to keep some of the older palm trees, it required the shuttle to make more of a zig-zag pattern, said Kaple. That will also add time to the journey.

Crowds of people lined up, some for hours, didn’t seem to mind the long, arduous wait.

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Michelle Jackson said, “I’m only waiting this long because this is like a historic thing. So it’s pretty exciting.”