Can I take Shen Chang Road from Beizhen Expressway?

Of course. According to Baidu map, you can take Shen Chang Road from Beizhen Expressway. If you enter Shen Chang Expressway from Naiying Expressway, you can rest in Beizhen Service Area. High speed refers to advanced speed, compared with medium speed and low speed. In the environment where low speed is dominant, low speed is normal speed or constant speed, and in the environment where medium speed is dominant, medium speed is normal speed or constant speed.