September 2020
Beginner to intermediate
528 pages
12h 33m
English
Content preview from Analytics Stories
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CHAPTER 47Red Light, Green Light, or No Light?
Since 1999, I have made over 50 trips to Redmond, Washington, to consult or teach classes for Microsoft. During each trip, I drive on I-405 from Sea-Tac Airport to my hotel in downtown Bellevue. The ramps on I-405 have ramp meters, which are traffic signals that cycle between green and red. When the light is green, a car is allowed to attempt to merge onto I-405. The first ramp meter in the United States was installed in 1953 on the Eisenhower Parkway in Chicago. In this chapter, we will explain how ramp meters can lessen freeway congestion and why some people oppose them. The U.S. Department of Transportation Ramp Management and Control Handbook is probably the most complete reference discussing ramp meters (ops.fhwa.dot.gov/publications/ramp_mgmt_handbook/manual/manual/pdf/rm_handbook.pdf).
What Causes Traffic Jams?
Clearly, if there are too many cars on the freeway, traffic will have to slow down. By increasing the fraction of time that ramp meters are red, traffic controllers can reduce the inflow of cars to the freeway during times of peak congestion. As pointed out by Gabor Orosz, R. Eddie Wilson, Robert Szalai, and Gábor Stépán (“Exciting Traffic Jams: Nonlinear Phenomena Behind Traffic Jam Formation on Highways,” Physical Review, vol. 80, no. 4, 2009, 046205), a mile-long traffic jam (the article calls it a backward traveling wave) can begin when one driver hits the brakes hard, thereby causing the driver behind them ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.