What are the key factors that cyclists should consider when riding on roads with no bike lanes or shoulders, and how do these factors influence the importance of different safety strategies, such as lane positioning, speed management, and communication with motorists? In particular, what role do situational awareness, road surface conditions, and traffic volume play in determining the most effective approach to riding safely on such roads? Are there any specific techniques or best practices that can help cyclists minimize their risk of collision or injury when riding on roads with no bike lanes or shoulders, and how do these techniques vary depending on the specific road conditions and traffic patterns?