Motor taxi-drivers

There are many ways to commute in Bangkok. Like in other cities, there are buses, humps of colorful taxis, an express train link to the airport, the Skytrain (BTS) or the underground metro (MRT).
But there are also two other typical means of transportation: the ubiquitous tuk-tuks or like on this photograph motorbike taxis.
The Thai society is extremely well organized. Say you get off the BTS on Sukhumvit (one of Bangkok main thoroughfares) and that you live in a soi (streets linked to a main avenue). You can still go home with another transportation. There is always a motorbike stand nearby to take you to your door. The drivers wear an official orange vest. However, it is not always certain that they will provide an helmet...