I run BRT-BRT and have no problems seeing it as long as the internal temperature of the vehicle does not exceed 150 degrees.
You would be surprised at how hot a vehicle gets in the summer sun parked for an extended amount of time with the windows up.
About 25 years ago I left a licence plate cover on my dashboard as I had not yet installed it, and it deformed due to excessive heat build up on a hot summer day.
Needless to say I purchased a cheap thermometer and put it in my car the next day only to find it can get well over 160 degrees if you leave your windows up and park in the sun during the summer months even here in New England.
Park in a shady area and crack your windows down an inch and there should be no issues.
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