Looking on the internet deeply has found these results:

in rush is the most popular phrase on the web.

at rush 12,070,000 results on the web	in rush 13,210,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Back to Back is an Australian company of people with intellectual disabilities. I saw their amazing show in New York at the Staten Island Ferry Terminal at rush hour. I hate the subway at rush hour. Great, Holland tunnel at rush hour. Girl almost kills boy by running a red light at rush hour. Barry's on the travel road of the dam, at rush hour, surrounded by cars. Like the 405 at rush hour. We can't take out an armoured truck at rush hour. Getting across town at rush hour will take a while.	It's a parkway, he's going to lose us in rush hour traffic. I drove down in rush hour. Live in rush hour traffic half your life, and work 80 hours a week. And we both drove across town in rush hour to buy this dress. And who takes Bloor Street in rush hour? Mine is 20 minutes up the road in rush hour traffic. I'll take a Soy Oreo shake and we're in rush. RADIO: If you're stuck in rush hour traffic on your way to work, or still in the shower, stick with us and we'll bring the sunshine into your day.

at rush

12,070,000 results on the web

in rush

13,210,000 results on the web

More popular!

Back to Back is an Australian company of people with intellectual disabilities. I saw their amazing show in New York at the Staten Island Ferry Terminal at rush hour.
I hate the subway at rush hour.
Great, Holland tunnel at rush hour.
Girl almost kills boy by running a red light at rush hour.
Barry's on the travel road of the dam, at rush hour, surrounded by cars.
Like the 405 at rush hour.
We can't take out an armoured truck at rush hour.
Getting across town at rush hour will take a while.

It's a parkway, he's going to lose us in rush hour traffic.
I drove down in rush hour.
Live in rush hour traffic half your life, and work 80 hours a week.
And we both drove across town in rush hour to buy this dress.
And who takes Bloor Street in rush hour?
Mine is 20 minutes up the road in rush hour traffic.
I'll take a Soy Oreo shake and we're in rush.
RADIO: If you're stuck in rush hour traffic on your way to work, or still in the shower, stick with us and we'll bring the sunshine into your day.