Q&A - Cyclists and texting

I witnessed an accident the other day between a cyclist and a truck. The cyclist was riding with no hands, looking down while texting on his cell phone. He did not notice that he had come to an intersection and rode into the side of a truck. He was not wearing a helmet and received more than a few injuries requiring an ambulance to attend. Are cyclists not required to obey the sections of the motor vwhicle act in a case like this?