AMP: 321 Location: State St and Main St, Rigby A couple blocks later, US-20 Business turns right AMP: 321 Location: State St and Main St, Rigby Turn right for US-20 Business. AMP: 321 Location: Farnsworth Way and Fremont St, Rigby After turning right the road will bear left and turn onto Farnsworth way, which bears the name of … Continue reading U.S. Route 20 Business, SH-48 to US-20