<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  How does a bridge support vehicles that pass over it? Context: Bridges support vehicles by distributing weight efficiently and transferring the load to the ground or supporting beams. Answer: [/INST]Bridges support vehicles by distributing the weight of the vehicles across their structure and transferring the load to the ground or supporting beams.</s>