Fatal Accident Closes Down I-15 For 5 Hours?

This evening, there was fatal accident by the I-15, and the NHP closed down the Interstate for 5 hours to investigate the accident.
http://www.lasvegassun.com/news/2010/sep/03/taxi-passenger-killed-fiery-crash-i-15/
Apparently the highway patrol doesn't know that at 6:00 and on Labor Day weekend, but there is a lot of traffic at that time.
I understand the need to investigate the accident, especially a fatal accident, but to close down the major Interstate for 5 hours is just stupid. They could have opened up the far right lanes, since the accident happened in the left lane.
It's time for the NHP to grow up and do their job and think of the big picture. It's not all about them, it's also about the other motorists on the road.
And to investigate an accident for 5 hours is outrageous. Maybe they need to some new traffic investigators who actually know what they are doing.