all ethnic groups has their ups and down it cant be smoth all the time, you were able to pinpoint the fact that Yoruba teenagers get pregnant easily, but you forget the fact that the  Yorubers are one of the most learned and versatile ethnic group you can think of in nigeria at large. 

it is unheard of in an advance world that a lorry is being allowed to tow another truck or lorry, most especially on high ways, there are vehicles assign to carry out this funcion, as long as this continues to happen on Nigeria roads accident are  bound to happen, so nigeria leaders, i think its hightime you all wake up from your slumber and stop killing innocent cityzens.may the gentle soul of those departed rest in perfect peace.