.... wastes fuel,
In recent years the cost of fuel for vehicles has ...

... more than doubled and the benefits of idling vs. re-starting the engine have disappeared.  Needless idling dirties your engine burns your hard earned dollars through your exhaust pipe. An idling vehicle is getting 0 miles to the gallon.

And remember ... fossil fuels are a non-renewable resource and are being depleted in the face of ever increasing world demand.

Handy metrics:

• Idling your vehicle for more than just 10 seconds uses more fuel than restarting your engine.
  
  

• Idling your vehicle for 10 minutes uses as much fuel as it takes to travel 5 miles.
  
  

• Idling your vehicle for 10 minutes a day uses more than 27 gallons of fuel a year.*
  

(Source: TheTransportation Program of Natural Resources Canada's Office of Energy Efficiency (OEE) & the Vermont Agency of Natural Resources)