While true, you can take advantage of the fact the most people don't perceive 2 sources of identical noise as 'twice as loud'. And given the extensive dynamic range of sound it is not uncommon to drown out sound with noise that's a few orders of magnitude louder.

Though I reckon it's more likely that the constant noise of drones will drown out the traffic noise than the other way around. Not just because it's constant but also because it's LOUD.