What precautions should I take when cycling in 30 degree weather to ensure my safety and comfort?

When cycling in 30-degree weather, take precautions to stay safe and comfortable by wearing layers of moisture-wicking clothing, including a thermal base layer, insulating mid-layer, and windproof outer layer. Also, wear gloves, a hat, and a scarf to protect extremities. Ensure visibility with reflective gear and lights, and stay hydrated by drinking water before and during the ride. Be cautious of icy patches and adjust your speed accordingly.