I am sorry that your son was so seriously injured while riding his bicycle. There are many parties that may be liable for his injuries . The county, city, state, or public agency that maintains the streets may be responsible for the bicycle accident. When city or county crews leave potholes unfixed, someone else can be injured by this road hazard. Potholes that aren't repaired are dangerous for cyclists and motorists. Speak with a local personal injury attorney who has experience with bicycle accidents. Generally there are no-obligation, free consultations where you can get all your legal questions concerning the accident answered.
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The city or municipality must have notice in order to be held responsible. Moreover, if the pothole is open and obvious, you may have another hurdle. Contact a local attorney.