Recurring dream

I was in my home. I went outside, and looked around. It was grim, dark afternoon. The sky was overcast. I saw my family. Everyone was waiting for me. I asked what is going on, and they told me that we have to drive somewhere. We drove on a highway. It was really high above the ground. Suddenly, I found myself on the road. I looked around. It was midnight. We had a huge car accident. I do not know why, but something told me to run away. I saw that there is a sidewalk on the highway, but my way back was blocked by huge piles of sawdust. I climbed up, and ran on the sidewalk. On the way I charged through layers of sawdust. After a while I heard someone following me. It was a group of my classmates. They were laughing for some reason, and shouting after me. I felt a little frightened, and I knew that they meant harm to me. I was running. After a short while the sidewalk was closed by fence and barbed wire. I knew that I was close to some kind of medical research facility. A top secret govrnment project. I was still escaping from the ambush of classmates. Interpretation: The ambush composed of classmates might show that I feel somehow opressed and anxious around them, which makes me try to escape from them. Notes: Its a recurring dream, but this time I ran away from the accident site, and ambush. In the past I was running to the accident site after hearing about my family. Also, no ambush before.