flashing red light on dash in ford focus

Does it look like any of these: http://www.haynes.co.uk/Press/Releases_HTML/060320...

That light is the PATS light (passive anti theft) The light flashes like most cars to tell you the system is active. As in you cars security system. That light tells you what the system is doing and flashes a certain number of times to tell you that there is a fault with the system. If the system is functioning normally the light will flash every 2 seconds when the ignition is switched off.

So you're driving along and a warning light flashes on, but because you don't know what it is you just keep driving anyway?

Ah, just noticed you're female.

Does the same light also come on yellow?

Fords have lights that are yellow when slightly cold outside as a warning and then red when it is very cold. It the light shaped like a snowflake?

That'll be my only suggestion. If it is anything else I am afraid I am of no help at all!

What little picture does it have on the light?

As someone else suggested, is it not an ambient temperature warning lamp?

Normally amber at 4 degrees, and red when it drops to 0 degrees