The e-way bill or the e-way bill number, in physical or electronic form. Does Route Deviation Never Justify Detention? If the consignment value and circumstances trigger the e-way bill requirement, an e-way bill must be generated. The person in charge should carry:A physical copy, orThe e-way bill number, orElectronic access to the e-way bill, as permitted. Common Practical Reasons for Route DeviationA route deviation can occur for perfectly legitimate reasons:Traffic congestion.