Illinois CDL Practice Exam.

Using chains on tires is specifically necessary in icy or snowy conditions. This practice enhances traction, which is crucial for maintaining vehicle control when driving in these hazardous conditions. When streets are covered with snow and ice, standard tires often lack the grip needed to prevent skidding or sliding, making chains an essential safety tool. While there may be some contexts in which driving in rainy conditions requires careful driving, chains are not typically used for rain. Long-distance trips do not inherently necessitate the use of chains unless specific conditions are present. Additionally, while mountainous terrain can present challenges, the requirement for chains is not limited to mountain roads alone; they are primarily about the road conditions, which can exist anywhere during winter weather.