WASHINGTON — General Motors’ high-profile ignition switch problem is not the only recall about which drivers need to worry. Millions of cars with safety issues are on the road, and even up for sale.

“This is an alarming issue,” says Christopher Basso, spokesman for CARFAX.

The vehicle history company says last year, 3.5 million used cars with unresolved recall issues were posted for sale online.

“With everything that we’ve seen in the last few weeks