sentences:  Joppa Road heads east toward Towson; MD 25 heads south as a two-lane road from the west leg of the intersection and north as a short four-lane divided highway continuation of the expressway.The only intermediate junction on MD 25A is a direct ramp from MD 25 to southbound MD 25A at the southern point of where the two highways run parallel.All of MD 25A is a part of the National Highway System as a principal arterial for its entire length.