The Voices:

Jill Apple, 28, Washington, DC, second-grade teacher; used to do voice-overs professionally, regular Metro rider

Steve Broido, 30, Washington, D.C., producer for "The Motley Fool" radio program

Linda Carducci, 49, Vienna, Va., legal assistant for Gannett; part-time DJ for WRQX; regular Metro rider

Sarah Fraser, 23, Washington D.C., traffic reporter for Westwood One and part-time disc jockey for 94.7 FM.

Jon Garcia, 35, Arlington, Va., producer for ABC News; regular Metro rider

John Howell, 35, Fairfax Station, Va., federal employee; regular Metro rider

Randi Miller, 44, Woodbridge, Va., lease retention manager at Lindsay Lexus

Angela Stevens, 24, Frederick, Md., traffic reporter for Clear Channel

Carol Rabel, 58, Silver Spring, Md., broadcaster

Mary Whittington, over 40, Washington, D.C., actor; regular Metro rider