Preheat your oven to 400°F.
Pat the pork loin dry and season generously with salt and pepper.
In a small bowl, combine olive oil, minced garlic from the cloves, chopped rosemary, and thyme leaves to create an herb marinade.
Rub the marinade all over the pork loin, ensuring an even coating.
Peel and cut the carrot, parsnip, and turnip into uniform chunks to ensure even roasting.
Toss the chopped vegetables in a little salt, pepper, and a drizzle of olive oil if desired.
Place the pork loin in the center of a roasting pan and arrange the vegetables around it.
Roast in the preheated oven for approximately 25-30 minutes, or until the pork reaches an internal temperature of 145°F and the vegetables are tender with crispy edges.
Allow the pork to rest for 5 minutes before slicing and serving alongside the roasted root vegetables.