Giving a left signal when going straight ahead is wrong. You only need to give a right signal half way round the roundabout to tell other road users you are going to exit the roundabout.
Giving a left signal when you have no intention of turning left confuses others and only increases the already dangerous activity known as driving in Qatar.
The worst offenders are lorry drivers and buses.
Indeed 95% of people driving here should not be - and that includes the locals.