Under GST, transporting goods without a valid e-way bill is a serious offense subject to penalties and detention. If the e-way bill expires before the goods start moving, it cannot be extended; the correct approach is to cancel and regenerate the bill within 24 hours or issue a new invoice or delivery challan to generate a fresh e-way bill. If the goods are already in transit and the e-way bill expires, the transporter may extend its validity through the portal by recording the delay reason. If extension is not possible, movement must stop, and a delivery challan with a new e-way bill must be prepared before continuing. Maintaining documentary proof of the goods' status during expiry is essential to avoid penalties. Compliance with these rules is critical to prevent fines, detention, and operational delays. - (AI Summary)