Uber or Lyft? Beware. 'Is everything OK?': Uber rolls out RideCheck safety tool nationwide Look for the beacon: Uber has begun rolling out a glowing sign it calls a "beacon" in some markets.

Uber and Lyft are two very similar services. Both are "ride-sharing" apps you pull up on your phone to quickly get a ride somewhere from a driver using their own car. These two services have ...