<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:  What are some common challenges in urban planning? Context: Common challenges in urban planning include balancing economic growth with environmental sustainability, addressing affordable housing issues, managing transportation and traffic flow, and preserving historical and cultural heritage. Answer: [/INST]Some common challenges in urban planning include balancing  economic growth with environmental sustainability, addressing affordable housing issues, managing transportation and traffic flow, and preserving historical and cultural heritage.</s>