A car travels along a circular roadway of radius \(R\) banked at an angle \(\theta\) above the horizontal, where \(\tan\theta > \mu_s\). The coefficient of static friction between the tires and the road surface is \(\mu_s\). If weather conditions cause \(\mu_s\) to decrease, how do the minimum safe speed \(v_{\min}\) to prevent sliding down the bank, the maximum safe speed \(v_{\max}\) to prevent sliding up the bank, and the range of safe speeds \((v_{\max} - v_{\min})\) change?