CB radio in the U.S. is 27 MHz, not the UHF CB you may be familiar with. Also, the solar cycle is irrelevant when using a CB radio for the few miles you will get out of it on the road.
You can purchase and use FRS radios which use/share most of the GMRS frequencies, but at reduced power and fixed antennas. FRS is licensed by rule, so nothing to submit/pay for to the government.