I have an interest in the history of New York City's traffic system, and I researched information within the last several years. The idea to write a book came to mind about two years ago, but it never went through. It was not until several months ago that I revisited the idea and began to develop my first book.
Called "New York City's red and green lights: a brief look back in time," the book revolves around the classic red and green lights that existed throughout New York City for over 80 years. It is an interesting history that not a lot of people are aware of. Though short, the book is based upon about five years of personal research.
Published in the last month, the book could be purchased for $28.00 either on Amazon or Barnes and Noble.
http://www.amazon.com/New-York-Citys-green-lights/dp/1619332213/ref=sr_1_1?ie=UTF8&qid=1441260053&sr=8-1&keywords=steven%20gembara
http://www.barnesandnoble.com/w/new-york-citys-red-and-green-lights-steven-gembara/1122427178?ean=9781619332218
Also, my publisher, FastPencil, has its own marketplace.
http://www.fastpencil.com/publications/7673-New-York-City-s-red-and-green-lights-a-brief-look-back-in-time
Glad to see they have a book about traffic lights