Verbal traffic alerts indeed work very well. While SD algorithms do a good job in reducing the number of traffic alerts to those that are truly relevant, more often then not the odd traffic warning competes in the headset with
- SD's airspace and obstacle warning
- and radio traffic from one or more monitored frequencies
It would be a great idea to 'pan' the stereo image of the verbal alerts? Typically, the radios come in mono, i.e., dead centre. Readability of parallel messages could be much improved if airspace warnings came slightly, say, from the left, and traffic warning slightly from the right.
Here is a simulation (curtesy to Garmin) of how spatially separating headset input sources can mirror the way our ears naturally “locate” sound in space — so the pilot can quickly identify which ones to focus on first.