When embalming is usually not needed
For road transport, the main requirement is temperature control and timely movement. A fresh body can usually be maintained for extended road travel when placed in a properly functioning freezer ambulance or AC freezer vehicle. Embalming is not the default requirement for highway transport.
When embalming may be needed for road transport
Embalming is considered after checking the body condition and arrival plan. It may be useful when the body has already started visible deterioration, there is odour, there will be a long display after arrival, or the receiving location asks for embalming paperwork.
What matters more than embalming on road routes?
Final recommendation depends on pickup city, destination, body condition, freezer availability, documents, route distance and destination timing.