In fact, even on the dual carriageway, they worked beautifully and at no point in the 600km tour I feel unsafe, you're safer in the countryside road as the motorists is likely to see you in a corner than further near the edge of the road.
The only time that the communication between me and other road user were poor was in cities that have bicycle lane, of which isn't where I should be riding on.
Primary position work outside the cities.
In fact, even on the dual carriageway, they worked beautifully and at no point in the 600km tour I feel unsafe, you're safer in the countryside road as the motorists is likely to see you in a corner than further near the edge of the road.
The only time that the communication between me and other road user were poor was in cities that have bicycle lane, of which isn't where I should be riding on.