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Theorem: In PG(2,q) with q even, there exists a projective triad of side (q + 2)/2 which is a blocking set of size (3q + 2)/2. [3] The construction is similar to the above, but since the field is of characteristic 2, squares and non-squares need to be replaced by elements of absolute trace 0 and absolute trace 1. Specifically, let C = (0,0,1).
Gridlock on a network of two-way streets. The red cars are those causing the gridlock by stopping in the middle of the intersection. Gridlock is a form of traffic congestion where continuous queues of vehicles block an entire network of intersecting streets, bringing traffic in all directions to a complete standstill.
Friends Select School (FSS) is a college-preparatory, Quaker school for pre-kindergarten through 12th grade located at 1651 Benjamin Franklin Parkway at the intersection of Cherry and N. 17th Streets in Center City Philadelphia. Quaker education in Philadelphia dates back to 1689. Friends Select, which was founded in 1833, has been located on ...
Some free-flow interchanges bring additional problems such as weaving or passing lane/fast lane exits (i.e. left exits in areas with right-hand traffic, and vice versa) that may be necessary to avoid additional costs, but lead to congestion and accidents and ultimately to an upgrade to another type of interchange.
A box junction in London, pictured from atop the Monument in 1969. A box junction is a road traffic control measure designed to prevent congestion and gridlock at junctions.The surface of the junction is typically marked with a yellow criss-cross grid of diagonal painted lines (or only two lines crossing each other in the box), and vehicles may not enter the area so marked unless their exit ...
Instead of blocking intersections, organizers should have a plan to regroup if riders get separated. Apologies to riders who love big groups, but from a safety perspective it’s not a great idea.
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[2] Refuge island in Lisbon, Portugal. Some traffic islands may serve as refuge islands for pedestrians. [3] Traffic islands are often used at partially blind intersections on back-streets to prevent cars from cutting a corner with potentially dangerous results, or to prevent some movements totally, for traffic safety or traffic calming reasons ...