Driving in Madrid is best avoided, because parking is a nightmare and traffic is challenging, but many of the nation's highways radiate from Madrid, including the A6 (Segovia, Salamanca, Galicia); the A1 (Burgos and the Basque Country); the A2 (Guadalajara, Barcelona, France); the A3 (Cuenca, Valencia, the Mediterranean coast); the A4 (Aranjuez, La Mancha, Granada, Seville); the A42 (Toledo); and the A5 (Talavera de la Reina, Portugal). The city is surrounded by ring roads (M30, M40, and M50), from which most of these highways are easily picked up. There are also toll highways (marked R2, R3, R4, and R5) that bypass major highways, and the A41, a toll highway connecting Madrid and Toledo.