I am noticing a flashing light on my dashboard. The item flashing is a car with lines coming from behind the car. it is beside d seat belt icon. What does it mean, and how can I fix it?

The symbol with a car and 2 curved lines behind means:
"Slip control" or "Stability control" (also known as ESC, ESP, ASR or DTC) warning.
Toyota Trac Inop Light Toyota's traction control helps you maintain traction on wet, icey, loose or uneven surfaces. There are complex wheel speed sensors that will trigger the traction control safety feature as needed. If you see the trac inop light illuminate, this feature might be disabled. A Toyota service rep can access the trouble code and identify what is needed to fix any potential issues. - See more at: http://jeffwylerclarksvilletoyota.com/section/secondary/toyota-dashboard-indicators#.dpuf

Toyota Dashboard Indicators

Sounds like a headlight malfunction light. this lets you know that you have a headlight or brake/tail light out. you can always check your manual for dash indicator explanations