This is approaching California City Blvd, and this section was being resurfaced and improved.
About here the speed limit goes to 70 and you see a sign post that says:
Las Vegas 204
58 was being built as a freeway just north of Mojave here. It was done in 2004.
This is twelve miles east of Mojave.
This is 12 miles east of Mojave.
This is taken 35 miles west of I15, three miles east of Kramer, and after Kramer (US395) it is a two lane wide highway.
Note the purple asphalt. You'll see more of this on I15 North of Barstow. There is a new expressway being built through here that is four lanes. There will be a railroad overpass also. It was started in late 2017 and it will be done in late 2020.