GREENSBORO, NC -- You've probably heard about the total solar eclipse by now.

The moon will cross in front of the sun casting a shadow across the United States on Monday, August 21st. Parts of the nation, like Columbia, South Carolina, will go dark for around two and a half minutes.

Read: Solar Eclipse Watch Parties Across The Piedmont Triad

So what if you're on the road? The North Carolina Department of Transportation says you need to plan ahead. They even put notices out on the main roadways reminding drivers of the celestial event.

WFMY News 2 Eclipse Special Section

NCDOT says to expect a lot of traffic. If you're traveling somewhere to watch the eclipse, arrive early and leave after the crowds have cleared to avoid congestion on the roads.

Read: 25 Burning Questions About Solar Eclipses, Answered

If you're driving during the eclipse DOT says do not pull off and park on the side of the road. Instead, you should find a parking lot or rest area to view the eclipse. You should NOT wear your eclipse glasses while driving.

Read: Where Can You Still Buy Eclipse Glasses?

If you are going to a city in the line of totality follow posted signs and instructions for directions instead of your GPS. NCDOT says traffic experts, highway patrol, and EMS officials will have accurate, up-to-date information.

There are 42 portable message boards across seven North Carolina counties to broadcast eclipse warnings and information. Three new closed-circuit TV cameras have also been installed and will be monitored so DOT can change traffic lights to keep cars moving.

Read: VERIFY: Is Looking At Eclipse Worse Than Sun?