電車のシート

2003.08.08 Fri 23:11

地下鉄の車両のシートは7人架けになっている。何故それがわかるかというと、1つのベンチシートには7つのくぼみとその間を仕切る6つの出っ張りがあり、その一つ一つの大きさは同じで、だいたい人間が腰掛けたらそれぐらいの面積を占有するだろうと思われる大きさだからだ。

その一席の大きさが実際にどのように決められたかは知らない。設計者にちょうどいい大きさなのかもしれないし、だいたいこんなもんだろうという予想かもしれない。日本人のお尻の大きさのの平均値かもしれない。しかしどんな理由で決められたにせよ、この席のサイズにぴったり合わない人はいるのだ。むしろそういう人のほうが多いのではないだろうか。

電車は公共交通施設であり、子供も老人も太った人も痩せた人も利用する可能性があるし、僕が知ってる範囲では、事実そのような多様な人たちに利用されている。にも関わらず座席は一定の大きさで区切られている。

物理的な体の大きさの話ばかりではない。人にはお互いの距離というものがある。親しい恋人同士なら隣りの席でぴったりくっついたってかまわないが、見ず知らずのオジサンにぴったりくっつきたいと思う人はあまり多くないだろう。しかし「一定区切りシート」はそれを強要するのだ。

平均値で7人がけのシートでも、体の大きい人ばかりが座れば5人しか座れないかもしれない。
子供の集団だったら10人座れるかもしれない。見知らぬ人が5人座っていて真ん中に二人分の隙間があれば僕はそのちょうど真ん中に座りたいと思う。しかし実際はそういう空き方はしてなくて、二人分の隙間を4等分した間隔で5人が並んでいることが多いんじゃないだろうか。誰かが乗ってきたらその時詰めればいいだけの話。シルバーシートじゃなくてもおじいちゃんには席を譲るというのといっしょ。それでいいじゃないかと思うのだけど。

しかもこのタイプの座席は新しい車両ほど採用されているような気がする。昔ながらのフラットなシートのほうがよっぽどユニバーサルデザインだなと。

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