We are travelling from Australia and will be driving between Las Vegas and San Diego on 21st January 2014, we were hoping to maybe take a more scenic detour via Hwy 18 - Rim of the World. Originally I was thinking to turn off near Barstow onto Hwy 247 then pick up Hwy 18 all the way to the 210. I do have to make a stop off in Buena Park and then head down San Diego. I have since found out that the weather at that time of year means that I would be needing snow chains around Big Bear. We will be driving a standard SUV. I have since revised this thought and are now thinking about turning off Hwy 15 and travelling along Hwy 138 to Hwy 18 and then coming into Hwy 210. I am wanting to know if this route will work. Google maps is suggesting that this will take approximately 6.5 hours. Can any one advise whether this would be the case or whether we would need to allow more time for this. I do need to be at Buena Park by about 4.30ish.
Thanks in advance for any help.