How to increase contrast in iPhone?
How to increase contrast? Roads other than main highways are almost invisible!
[Re-Titled by Moderator]
iPhone 12 Pro Max, iOS 14
Question marked as
You can: Adjust the screen brightness and color on iPhone - Apple Support
Wondering which map you are viewing, and whether choosing another map may help:
Apple support's online article: View maps on iPhone - Apple Support
says:
"Choose the right map
The button at the top right of a map indicates if the current map is for exploring 
, driving 
, riding transit 
, or viewing from a satellite 
. To choose a different map, do the following:
- Tap the button at the top right.
- Choose another map type, then tap
.
You can get driving, cycling, walking, and transit directions or get traffic and weather info in Maps."
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Else:
You may want to experiment with settings : Find your Maps settings on iPhone - Apple Support