Implementing legal requirements for hedgehog highways on new housing developments may face several challenges. One major obstacle could be resistance from developers or homeowners who may view such regulations as an additional burden or cost. Ensuring compliance and enforcement of these laws could also be challenging without proper monitoring mechanisms in place. Balancing the needs of urban development with wildlife conservation efforts might lead to conflicts over land use priorities. Moreover, there could be logistical issues related to designing effective pathways within densely populated areas while considering factors like property boundaries and landscaping preferences.