This quiz will help you understand how much you know about the most common and arcane aspects of bridge and utility history, design, construction, inspection, and maintenance. Share it with your coworkers and compare your results!
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Countless bridges claim to be &#;the longest.&#; However, varying measuring standards across the globe make difficult to determine the actual record holder. Since it&#;s hard to identify the ultimate &#;longest,&#; match each of the following bridges with the category it holds the record length for.
1. Longest bridge over water A. Krämerbrücke, Erfurt, Germany 2. Longest inhabited bridge B. Taman Negara, Kuala Lumpur, Malaysia 3. Longest canopy walkway C. Evergreen Point, Washington 4. Longest floating bridge D. Danyang-Kunshan Grand Bridge, China 5. Longest rail bridge E. Lake Pontchartrain Causeway, Louisiana[expand title=&#;Answer&#;]
Bridge: A. Krämerbrücke, Erfurt, Germany B. Taman Negara, Kuala Lumpur, Malaysia C. Evergreen Point, Washington D. Danyang-Kunshan Grand Bridge, China E. Lake Pontchartrain Causeway, Louisiana Inhabited bridge Canopy walkway Floating bridge Rail bridge Bridge over water Length: 259 feet 1,509 feet 7,710 feet 102 miles 24 miles Interesting fact: This charming bridge is lined by 62 three-story half-timbered homes, many with shops on the first floor. This rope walkway gives visitors a unique opportunity to view the jungle. Plagued by construction issues, the world&#;s longest floating bridge was recently completed over Lake Washington in Seattle. This railroad bridge is also generally considered the world&#;s longest one overall. It connects Shanghai and Nanjing. Since , this has been designated the longest continuous bridge built over water. The Jiaozhou Bay Bridge in China is longer, but certain sections run over land.[/expand]
Which of the following is closest to the total number of bridges in the United States?
[expand title=&#;Answer&#;]600,000. According to the latest edition of the Report Card for America&#;s Infrastructure, there are currently 607,380 bridges in the U.S.
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According to the Report Card for America&#;s Infrastructure, how many vehicular trips are taken across structurally deficient and functionally obsolete bridges each day?
[expand title=&#;Answer&#;]200+ million. The National Bridge Inventory Database defines a structurally deficient bridge as one with single or multiple defects to be addressed. A functionally obsolete one is structurally sound but inadequate for its purpose. The reasons for this could include things like not having enough lanes to meet current traffic requirements, inability to support heavy modern vehicles, or not providing adequate shoulder space to handle emergencies.
Important point: Functional obsolescence doesn&#;t mean structural issues are present on a bridge. The real problem is that design inadequacies often lead to inconvenience, dangerous situations, or negative economic impact in the surrounding community.[/expand]
Which of the following bridges has become a tourist attraction because it&#;s also a fountain?
[expand title=&#;Answer&#;]
The Banpo Grand Bridge over the Han River in Seoul, South Korea has 380 nozzles that send 60 tons of water cascading 140 feet horizontally and 65 feet downward into the water below every minute. In the evening, LED lights illuminate the water, which moves in time to 100 different pieces of music. The bridge is just over 3,740 feet long.[/expand]
LEGO fans compete to build big structures using the colorful toy blocks. A model of which of the following bridges currently holds the record for the largest LEGO model?
[expand title=&#;Answer&#;]
A model of the London Bridge, built using almost six million LEGO components, holds the record for the largest LEGO structure. It took people affiliated with the auto company Land Rover more than five months to plan and construct it.[/expand]
In what year was the oldest still-operating bridge in the United States constructed?
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[expand title=&#;Answer&#;]
The Frankford Avenue Bridge (sometimes referred to as the Pennypack Creek Bridge) was built all the way back in in the Holmesburg area of Northeast Philadelphia. The three-lane bridge still carries a significant amount of traffic over Pennypack Creek every day.
The original purpose of the bridge was to connect William Penn&#;s mansion with the new city of Philadelphia. It was part of the first major bridge construction project in the United States, designed to link cities in the Northeast. It has been regularly improved over time to meet new traffic needs. The bridge has been on the National Register of Historic Places since .[/expand]
True or false: Utility lines supported from bridges are safe and secure because they&#;re usually isolated far underneath the structure. This protects them from weather, construction damage, human tampering, and other unexpected events.
[expand title=&#;Answer&#;]False. Utility lines are vulnerable, even if they&#;re hung under big, expansive bridges. They need to be supported correctly and protected by caging systems specifically designed for this purpose. Otherwise, they could be damaged by hurricanes, floods, winds, earthquakes, terrorists, and accidents. Utility infrastructure is a big investment that communities depend on, so it&#;s worth protecting it.[/expand]
What state has the most covered bridges?
[expand title=&#;Answer&#;]
The novel, &#;The Bridges of Madison County,&#; (and subsequent movie) made the covered bridges of that Iowa county among the most famous in the nation. However, according to the Covered Bridge Society, Pennsylvania is home to the largest number of these charming structures, with 213. Ohio is second with 148. When it comes to one county, Parke County, Indiana is the leader with 31 covered bridges.
A couple more interesting covered bridge facts:
Thanks for taking the quiz! We hope you learned a thing or two and have come to further appreciate the strength and beauty of bridges.
300ft is an easy run. You could do the same thing with regular APs using directional antenna, if you really wanted to. You don&#;t need huge, high-gain antennae or anything fancy.
The big questions are what bandwidth do you want to support, and how much resistance to interference do you need? Since these solutions run on 2.4 or 5GHz, you need to be prepared for spurious signals cutting into your performance or cutting the connection entirely at times. In either case, the consensus is the NanoBeam will do better than the NanoStation in this role, with a narrower beam. They advertise 450Mbps and up, but in reality you&#;ll probably get 150-300Mbps throughput. If you REALLY wanted to get serious, they offered a &#;Building to Building bridge&#; set that seems to still be sold out, or you can get a pair of AirFiber 60s. These will give you Gigabit connectivity at 60GHz, where the only interference you might get would be radar&#; They also seem to have a new one called the &#;GigaBeam&#;, which is pretty much the same thing.
The Ubiquiti stuff is still relatively cheap, with the Gigabit solutions being around $500US, and the NanoBeams being about half of that. Spring for the Gigabit stuff, if you can. I&#;ve spent tens of THOUSANDS over the years for the same setup you seem to be able to do now for around $1k&#; I&#;m jealous.
As for mounting, the 5GHz stuff is pretty flexible. A small pole on the roof, or a proper upside-down &#;T&#;-shaped base and pole that&#;s high enough to get you 10-14 feet above the roofline for a clear, unobstructed view. Having a three-point guywire is definitely a bonus. They don&#;t mention it, but the 60GHz stuff can be VERY fickle for mounting. It was easier for me, being in a steel fabrication shop, to go with wall-mounted 8-14 foot THICK steel pipes that were triple-anchored into the wall at three points. Those suckers are only moving if the wall collapses, so those antennae will stay centered on each other no matter what. (If you can do this, you can also look at IR/Laser solutions, but they seem to be losing out to radio.)
Most of these solutions will have built-in lightning/surge protection. It&#;s never been an issue for me, but would also be cheap to put something inline, if you had to. Losing a $400 antenna isn&#;t something that would hurt all that much, so long as a replacement was available.
The below are mounting examples. The ones I was talking about are like the one in the middle, but that could be considered overkill&#;
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