fast lane

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A lane on a highway for use by faster moving vehicles.
• noun Informal A hectic or frenetic way of living, especially when involving the pursuit of sensual pleasure.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun On a multilane road, the lane intended or reserved for vehicles moving at faster speeds.
• noun figuratively, by extension Any situation or activity where the pace is very rapid.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the traffic lane for vehicles that are moving rapidly
• noun a hectic and pressured lifestyle often characterized by recklessness or dissipation