Catwalks hang over a section of the newly constructed eastern span of the San Francisco-Oakland Bay Bridge during a media tour of the self-anchored suspension span tower on August 29, 2011 in Oakland, California. Contruction crews have erected twelve foot wide catwalks that connect to the San Francisco-Oakland Bay Bridge self-anchored suspension span's tower and crews will begin to lay the nearly one mile of main cable beginning in early 2012. The bridge has been under constrution since 2002 with an estimated price tag of $6.3 billion and will have the world's tallest Self-Anchored Suspension (SAS) tower once completed. (Photo by Justin Sullivan/Getty Images)

Protesters run for cover after riot police fired tear gas towards the bridge they were climbing down to the road below, to escape from Hong Kong Polytechnic University campus and from police, in Hung Hom district in Hong Kong on November 18, 2019. Dozens of Hong Kong protesters escaped a besieged university campus on November 18 by lowering themselves on a rope from a footbridge to a highway, AFP video showed. Once on the road they were seen being picked up by waiting motorcyclists. (Photo by Anthony Wallace/AFP Photo)

Toyota revealed its i-Road concept, a three-wheeled all-electric motorcycle of sorts that seats two. The unique design is only 33 inches wide, which would make it tops in buzzing in through and around traffic. An Active Lean system tilts the i-Road through corners like a motorbike, while the cabin (which seats two in a tandem layout) is fully enclosed. Maximum range is about 30 miles. (Photo by Luis Fernando Ramos/G1)

In this August 1, 2014 photo provided by the National Park Service are male caribou antlers in the Oolah Valley, likely the result of a grizzly kill as he migrated south for the winter at the Arctic National Park and Preserve in Alaska. The nation's northernmost national park says its new management plan will have to consider the effects of a new industrial road to the mining district of Ambler, the first road that would be constructed within its Maryland-sized boundaries. (Photo by Cadence Cook/AP Photo/National Park Service)

Switzerland's cyclist Marlen Reusser reacts after placing second in the women' elite time trial race of the UCI World Championships Road Cycling Flanders 2021, in Bruges, on September 20, 2021. UCI World Championships Road Cycling Flanders 2021 takes place from September 19 until September 26, 2021, in several cities in the Belgian region of Flanders. (Photo by Simon Wilkinson/BELGA via AFP Photo)

A view of lava crossing the main road to Grindavík and flowing on the road leading to the Blue Lagoon, in Grindavík, Iceland, Thursday, February 8, 2024. A volcano in southwestern Iceland has erupted for the third time since December and sent jets of lava into the sky. The eruption on Thursday morning triggered the evacuation the Blue Lagoon spa which is one of the island nation’s biggest tourist attractions. (Photo by Marco Di Marco/AP Photo)

A postman walks past an art work titled “Alphabetti Spaghett” by artist Alex Chinneck on Norborough Road in Sheffield, Yorkshire, England on September 26, 2019. (Photo by Danny Lawson/PA Images via Getty Images)

An Iraqi demonstrator runs as others burn tyres to cut-off roads in the southern city of Basra on November 25, 2019. (Photo by Hussein Faleh/AFP Photo)