Would any one kindly elaborate how avoidance learning helps avoiding road accidents?

Avoidance learning is a type of conditioning which occurs when an organism learns to respond, through past direct or indirect experience, in a way that allows its evasion. For example if a student failed in his last exam because he did not prepared well then he would study hard the next time in order to avoid the consequence of failure.
In a similar way avoidance learning plays an important role in avoidance of traffic accident. A person, by his past experience, knows the consequences of traffic accident, therefore he takes all the precautions necessary to avoid such an event.

From your explanation,looks like avoidance conditioning is a blend of both classical conditioning and oparant conditioning.evasion is due to past experiences(classical) and prevention of aversive or unpleasent consequences to occur may be a form of reinforcement(negative).responce is strengthened as a result of removing unpleasent stimuli.

Members are requested to correct me if i am wrong in judging the case.
regards.

Yes we can say that its a mixture of both.

Avoidance learning

Avoidance learning belongs to negative reinforcement schedules. The subject learns that a certain response will result in the termination or prevention of an aversive stimulus. There are two kinds of commonly used experimental settings: discriminated and free-operant avoidance learning.
Discriminated avoidance learning

In discriminated avoidance learning, a novel stimulus such as a light or a tone is followed by an aversive stimulus such as a shock (CS-US, similar to classical conditioning). During the first trials (called escape-trials) the animal usually experiences both the CS (Conditioned Stimulus) and the US (Unconditioned Stimulus), showing the operant response to terminate the aversive US. During later trials, the animal will learn to perform the response already during the presentation of the CS thus preventing the aversive US from occurring. Such trials are called "avoidance trials."

Free-operant avoidance learning

In this experimental session, no discrete stimulus is used to signal the occurrence of the aversive stimulus. Rather, the aversive stimulus (mostly shocks) are presented without explicit warning stimuli. There are two crucial time intervals determining the rate of avoidance learning. This first one is called the S-S-interval (shock-shock-interval). This is the amount of time which passes during successive presentations of the shock (unless the operant response is performed). The other one is called the R-S-interval (response-shock-interval) which specifies the length of the time interval following an operant response during which no shocks will be delivered. Note that each time the organism performs the operant response, the R-S-interval without shocks begins anew.

Two-process theory of avoidance

This theory was originally proposed in order to explain discriminated avoidance learning, in which an organism learns to avoid an aversive stimulus by escaping from a signal for that stimulus. The theory assumes that two processes take place:

a) Classical conditioning of fear.
During the first trials of the training, the organism experiences the pairing of a CS with an aversive US. The theory assumes that during these trials an association develops between the CS and the US through classical conditioning and, because of the aversive nature of the US, the CS comes to elicit a conditioned emotional reaction (CER) – "fear."
b) Reinforcement of the operant response by fear-reduction.
As a result of the first process, the CS now signals fear; this unpleasant emotional reaction serves to motivate operant responses, and those responses that terminate the CS are reinforced by fear termination. Although, after this training, the organism no longer experiences the aversive US, the term "avoidance" may be something of a misnomer, because the theory does not say that the organism "avoids" the US in the sense of anticipating it, but rather that the organism escapes an aversive internal state that is caused by the CS.