I supporting a large fleet of semi tractors that all have Cobra 29LTD Classic radios installed in them, which do get used along the I-5 corridor. There is less traffic, and newer radios are built a lot cheaper and less robust than their older counterparts, but they are still in use. There are days when some of the maintenance bays look like a Loves Truck stop, with Cobra radios and FireStik antennas strewn about. While the tractors come pre-wired for CB, and have dual antennas mounted to the outside mirrors, only one is wired to where the radio is mounted in the headliner.
For vehicles that are going into the logging roads and hills, CB is still a must. It may be the only way to know what is travelling down the secondary roads.