Zebra Crossing Berbentuk

Pedestrian crossings explained

Satuan Polisi Lalu-lintas (Polantas) Polres Garut, Jawa Barat, akan melakukan razia gabungan besar-besaran bersama TNI dan Dinas Perhubungan hingga dua pekan ke depan.

Banyak orang lebih nyaman duduk di bagian window seat ketika naik pesawat. Alasannya beragam, ada yang pengin melihat pemandangan awan, merasa cemas jika tidak di dekat jendela, hingga ingin mengabadikan momen-momen indah dalam bentuk foto dan video. Kalau kamu tipe yang mana?

Jendela pesawat umumnya berbentuk oval. Tidak pernah bundar sempurna atau bahkan segitiga. Alhasil banyak orang mempertanyakan kenapa bentuk jendela di pesawat selalu oval. Apakah ada alasan di baliknya?

Nyatanya, pemilihan bentuk oval untuk jendela pesawat ada alasannya, lho. Beberapa di antaranya bisa kamu ketahui melalui ulasan berikut ini, nih!

Jendela pesawat awalnya berbentuk persegi

Kamu mungkin belum tahu kalau jendela pesawat dulunya berbentuk persegi. Pesawat dengan jendela persegi naik daun sepanjang pada era 1940—1950an, apalagi untuk keperluan jet, seperti dilansir Simple Flying. Penumpang pun nyaman dengan jendela pesawat berbentuk persegi.

Sayangnya, salah satu pesawat jet tersebut, yakni de Havilland Comet, mengalami kecelakan pada 1953 di India. Hal tersebut disebabkan tekanan di dalam kabin dan jendela pesawatnya yang tak mampu menahan. Selama lima tahun ke depannya, tiga pesawat juga alami kecelakaan tragis.

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Pegasus crossing rules and how to use one

Press the crossing demand button and wait for a green light. When you are permitted to cross, double check that all traffic has stopped before setting off.

Treat Pegasus crossings in the same way you would Puffin, Toucan and Pelican crossings, but don’t be surprised to see a horse crossing the road. Also be sure to keep any noise down in order to prevent startling the horse - do not use the horn and avoid excessively revving the engine.

A Pegasus Crossing is a type of crossing controlled by traffic signals. They work in a similar way to pelican crossings except extra push buttons are made available at an increased height for horse riders. Red and green horse pictograms may also be used.

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A push-button controlled crossing which permits equestrian as well as pedestrian use. A second push-button box is mounted higher up such that the horse rider does not need to dismount to operate the crossing.

Pegasus crossings are sometimes used in conjuction with a toucan crossing with separate crossing points for equestrians and cyclists.

Example of combined pegasus and toucan crossing on NCR21: http://goo.gl/maps/Mi4Q4 (Equestrian portion in the foreground and cyclist portion in the background)

Type of pedestrian crossing

A pegasus crossing (United Kingdom; also equestrian crossing) is a type of signalised pedestrian crossing, with special consideration for horse riders. This type of crossing is named after the mythical winged horse, Pegasus. They are primarily used in the United Kingdom and Peru.[1]

At a minimum, these crossings are in the form of a pelican crossing or puffin crossing but simply have two control panels, one at the normal height for pedestrians or dismounted riders, and one two metres above the ground for the use of mounted riders, and the "green man" (walk) and "red man" (stop) pictograms are replaced with horses. Additional features, to improve safety, include a wooden fence or other barrier and a wider crossing so that the horses are further away from vehicles than normal.

If the crossing is to be used by pedestrians and cyclists too, then a parallel, separate toucan crossing may be placed next to the pegasus crossing.[2][3]

Installation and removal

There are examples in Hyde Park, Richmond Park and village area of Wimbledon in London; Rayleigh, Colchester and Great Notley in Essex and Worsley, Salford as well as near Epsom Downs Racecourse, Surrey and in Colton on the former A6120 (now B6902) in Leeds. The crossing in Colton has a separate gravel covered section, signposted for use by horses only, located at 53.795888,-1.436130. Another example is situated between Whitby and Robin Hood's Bay, North Yorkshire on Stainsacre Lane.

After completion of upgrading the A66 between Greta Bridge–Scotch Corner in 2007,[4] two pegasus crossings were installed on the section of the dual carriageway in 2009, immediately to the west of Scotch Corner. These crossings included raised buttons for horse riders, safety fences and lights to control the traffic which consisted of only two orange lights. These crossings never became operational and with the exception of the safety fences were later[when?] removed.

There are also examples in use in Lima, Peru.

Control panel for equestrians,

A Pegasus crossing - also known as an Equestrian crossing - is designed to allow horse riders to cross the road. These crossings are found on bridleways and, in some instances, there may be another crossing located next to it in order to accommodate foot and cycle traffic.

Much like Toucans and Puffins, Pegasus crossings use sensors to detect when there are people waiting to cross or already crossing. They are also much wider in order to allow sufficient room for the horses.

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The black and yellow box is also fitted higher than on any other crossing, this is to allow a rider to press the button without getting off their horse.

Menjaga tekanan di dalam pesawat lebih merata

Alasan utama pesawat selalu memiliki jendela berbentuk oval bertujuan demi menjaga tekanan udara di dalam pesawat. Pasalnya, ketika terbang di atas 10.000 kaki, tekanan di dalam kabin pesawat mencapai 11—12 psi, sedangkan di luar mungkin hanya 4—5 psi.

Dilansir dari Simple Flying, jendela ovel dipilih karena bentuknya memungkinkan untuk menjaga tekanan di seluruh bagian dalam pesawat. Desainnya juga tahan terhadap deformasi, sehingga lebih kokoh dan tahan lama.

Sudah lebih dari 70 tahun, pesawat menggunakan jendela pesawat berbentuk oval. Sebelum itu, bentuk jendela pesawat memang berbeda, tetapi tidak semenguntungkan jendela oval.

Jendela oval di pesawat diberi lapisan lindung

Selain bentuk, tentu ketahanan dari bahan yang digunakan pada jendela pesawat patut diperhatikan. Selama penerbangan, kamu bisa memperhatikan jendela pesawat yang terbuat dari tiga lapisan akrilik.

Bagian terluar yang paling tebal dan menyerap semua tekanan, sedangkan yang di tengah memiliki lubang kecil untuk menyamakan tekanan dan melindungi bagian dalam. Lapisan yang bisa kamu pegang adalah paling tipis, karena hanya menerima tekanan dari kabin yang relatif kecil.

Insiden jendela rusak atau terbuka saat penerbangan memang pernah terjadi, tetapi sangatlah jarang. Pada 2018, kerusakan mesin pesawat maskapai Southwest AIrlines menyebabkan jendela terbuka. Insiden nahas tersebut memakan korban.

Jendela oval menghemat biaya maskapai penerbangan

Seperti yang sudah disebutkan pada poin sebelumnya, desain jendela pesawat berbentuk oval lebih kokoh, sehingga tahan lama jika dibandingkan dengan jendela persegi. Hal tersebut tentu berpengaruh pada pengeluaran maskapai penerbangan yang lebih hemat.

Pihak maskapai tinggal merawat jendela pesawat oval sebaik mungkin, agar tetap bisa digunakan. Mereka juga memeriksa ketahanan lapisan jendela secara berkala, supaya penerbangan terasa aman.

Jendela pesawat yang berbentuk oval ternyata ada tujuannya. Mulai dari mengurangi tekanan udara di dalam kabin, hingga mengurangi biaya operasional maskapai penerbangan. Sekarang kamu sudah gak penasaran lagi, kan?

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