Sometimes I use those little red open sided vans that go up and down the Soi's running a shuttle-bus service from the BTS stations in Bangkok, but I'm not sure what they are called?

I've heard them called 'see law lek' (little four wheeler?). 'bok-bok', 'Daihatsus' and even 'tuk-tuk' although they have 4 wheels .... but if I use any of these phrases people don't seem to be sure about what I'm on about.

Is there a common name for them?

They also seem to be very cheap .... I don't know how the fare is worked out, but I get change from a 10 Baht coin no matter how far I go up the Soi!

Daihatsu Hijet Tuk Tuk.

In my Soi, They are called "Rod Ka Por" (รถกะป๊อ)

use "rot ga baw"

sometimes they are called "rot SUBARU", even when they arent made by Subaru.....