Table 2.

The absolute frequency with which a particular auditory icon was associated with a given situation and the median value of the match (1= weak match, 5=strong match). Empty cells represent cases where no response occurred, light grey cells correspond to specific warnings and dark grey cells correspond to more general warnings. Distracter sounds are excluded.

Situation (Y)
Warning (X)	Bike	Crosswalk	Bus	Construction	Lead vehicle braking highway	Lead vehicle braking city	Merge	Curve	Traffic light	Stop sign	Speed sign	Oncoming car	Row sum (X)
Bike bell 1	8 (4)		1 (5)					1 (5)	1 (3)		1 (5)	4 (5)	16
Bike bell 2	3 (2)	0.5 (2.5)									1 (2)	1 (1)	6
Footsteps 1	4 (3.5)	9 (3)	7 (3)			3 (3)					1 (4)	2 (2.5)	26
Footsteps 2	3 (3)	4 (3)	2 (2)			1 (5)					1 (4)		11
Jackhammer	1 (2)		2 (3)	9 (3)	1 (1)			2 (2)	1 (4)	1 (1)	1 (2)		18
Screeching tires	1 (1)	5 (2)	4 (3.5)	4 (3.5)	2 (2.5)	2 (3.5)		2 (3.5)	6 (3)	5 (3)	2 (3)	3 (4)	36
Crash	2 (2)	2 (3)		2 (2.5)	1 (3)	1 (3)			2 (3)	2 (2.5)			12
Siren	3 (4)	2 (5)	4 (4.5)	3 (4)	3 (4)	4 (3)	2 (4.5)	4 (3)	6 (4)	4 (4.5)	3 (4)	3 (4)	41
Car horn	6 (3)	4 (3)	3 (4)	2 (3)	3 (3)	4 (2)	1 (1)	1 (1)	2 (4.5)	1 (2)		7 (4)	34
Column sum (Y)	31	27	23	20	10	15	3	10	18	13	10	20