During the weekday rush hour, a myriad of cars clogs the highway to the east, but we don't see this number on the weekend.
During the weekday rush hour, a myriad of cars clogs the highway to the east, but we don't see this amount on the weekend.
During the weekday rush hour, a myriad of cars clogs the highway to the east, but we don't see this number on the weekend.
During the weekday rush hour, a myriad of cars clogs the highway to the east, but we don't see this amount on the weekend.
When talking about something countable, something for which we would ask "how many?" instead of "how much?", then we need to use "number," not "amount."