Here are 2 reasons
Easy to understand
When you’re on the road, we think it makes a lot of sense to speak the same language as the motorists around you. Most accidents occur when drivers don’t see you or misunderstand your intentions.
It is very common for drivers to misunderstand or completely miss hand turn signals. That is why we believe that using the familiar orange turn signal is the best and safest way for a cyclist to express their intentions.
Safer and more visible
Unlike hand turn signals, you can leave the turn signals on throughout our whole turn without getting off-balanced and falling while trying to do so.
Since these turn signals are located at eye-level, they are also easier to spot by the drivers around you.