What special attention is required when transporting compressed gases?

Answer: C — They must be transported in their upright position and secured against movement

When transporting compressed gases, it is crucial to ensure that they are transported in their upright position and secured against movement. This is important because compressed gas cylinders are designed to remain vertical to avoid any risk of them tipping over, which could lead to ruptures or even explosions. Securing them prevents them from rolling or sliding during transport, which could cause damage to the cylinder or its valve. Additionally, being upright helps maintain the proper release of the gas in case of an emergency, ensuring that the pressure remains consistent. Transporting them in a horizontal position or placing them near the front of the vehicle could create instability and increase the risk of accidents. Loading them last and unloading first might not specifically address the safety concerns related to the orientation and securing of the cylinders. Hence, maintaining the proper position and securing them is the best practice for safety when transporting compressed gases.