In which scenario should a motorcycle rider back off their speed?

A motorcycle rider should back off their speed during poor weather conditions because reduced visibility, slippery surfaces, and unpredictable road conditions can significantly increase the risk of losing control over the motorcycle. Inclement weather, such as rain, snow, or fog, can affect traction and braking distance, making it crucial for riders to slow down to maintain control and react to hazards.

In contrast, approaching a straight road typically does not necessitate a reduction in speed, as it usually presents few immediate dangers. Riding in a group requires coordination but doesn't inherently call for slower speeds. On a clear day, the riding conditions are generally safer, allowing for normal speeds, assuming other factors are controlled. Therefore, slowing down in poor weather is essential for safety.