keyword

when did stop signs become red

Monthly search volume and cost-per-click data for "when did stop signs become red" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=when+did+stop+signs+become+red&country=us" +--------------+------------------+ | volume | 50 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-06-20 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
red stop sign	1,300	$1.93	14/20
why is the stop sign red	170	$0	12/20
stop sign color	170	$0	10/20
why is a stop sign red	170	$0	10/20
why stop signs are red	170	$0	10/20
did stop signs used to be yellow	50	$0	11/20
when did the stop sign become how it looks today	50	$0	11/20
what color were stop signs originally	40	$0	13/20
original stop sign color	10	$0	12/20
what color did stop signs used to be	10	$0	11/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://app.seodata.dev/v1/keyword?q=when+did+stop+signs+become+red&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt