History and impact of traffic signals through time
A historical overview explains traffic signals from ancient Egypt to modern Cedar Rapids. It notes early devices, gas signals with hazards, and the role of engineers like Mel Meyer in evaluating intersections. The piece discusses when signals improve flow and when they cause accidents, and lists factors for warranting a light at a corner.
MENTIONED IN THIS ARTICLE
Harry Green
Eagle Signal Co
Cedar Rapids
Mel Meyer
Traffic signal types and rules summarized
A concise guide explains traffic signal standards across corners. It outlines uniform light rules, corner choices with stop or yield signs, and three main signal types: pre timed, actuated, and semi actuated. Pre timed fixed cycles, actuated respond to vehicle presence, and semi actuated mix elements for intersections with limited cross traffic.
Understanding Traffic Signals and Their Cycles in the City
The article explains how pre timed and actuated signals operate with cycles from 70 to 90 seconds, Center Point Forty second intersection at 144 seconds, and how call loops and presence loops trigger signals. It discusses splits, peak adjustments, and the potential for computerized traffic signals guided by street sensors to improve flow.
MENTIONED IN THIS ARTICLE
Center Point Road
Forty-second Street
Meyer
Open Door Policy: 1899 Trade Move By U S Secretary Hay
The Open Door policy declared by U S Secretary of State John Hay urged equal trade for all nations in China. It aimed to keep China open to commerce and preserve its territorial and administrative integrity.
MENTIONED IN THIS ARTICLE
China
U.S
John Hay
England
Russia
Japan
Germany
France
Italy
United States
Also Mentioned on This Page
Eta
Egypt
House of Parliament
Dennis Bates
Tops
Jeans
Jovan
Jovan Muse Oil
Dorothy Arnold
Armstrong's, Inc
Iowa
Lowa
Hans
Armstrong Hosiery
Baby Department
Peterson
Armstrong Baby Shop
Terry
This is just the beginning! Our collection holds over 300 years of history, including rare newspapers, obituaries, marriage records, birth records, and so much more—most of which you won’t find anywhere else!