There are many things that can cause this. It can even be the HDD the game is installed on. The game has not enough computing resource to render your game in time, that's why the road is not streaming fast enough. Try some of these tips, it may fix your problem (and make your PC run faster) .
http://windows.microsoft.com/en-us/windows/improve-computers-performance#1TC=windows-7
http://www.wikihow.com/Improve-Computer-Speed-Performance
Anyway, what are you PC specifcations?
I have same problem on i7 6700hq 2.6ghz / 16go ddr4 / gtx970m 3go gddr5..... unbelievable, everytime on the highway (orange road on map)....
i have enough power, enough ram, nor programs at all running.... every time when I drive fast the map can't load. and i have to stop the car to load the map..... unbelievable,
my computer is new and clear as hell ^^
not trying it, because i have the PC to launch this game maxed out..... all the latest games run crazy fine.... :/
my laptop is enough good i know it , even low end pc can play it i think they need to fix it at launch, there was same problem on PS4 and xbox one versions 😉
