Topic : Most bike accident are due to equipment failure, weather conditions,and bike carelessness.
A: Defective equipment can cause bike accident.
1: The bike has poor brake.
2: The bike has weak light.
B:The second cause is weather conditions.
1: The rain can make the roads slippery.
2: The windy makes biker to difficult balance.
C: Biker may be carelessness.
1: The biker doesn't stop sing.
2: The bike ride a bicycle to fast.
Conclusion: The biker should ride a bicycle to careful not be careless and check the condition of cycling every before use it.