Most Rome-to-Amalfi road trip guides sell you the drive as one continuous, dreamy stretch of coastal cliffs and lemon groves. The highway portion from Rome down to the Amalfi region genuinely is straightforward. What most of those guides gloss over — or bury deep in the fine print — is that the coastal road itself, the SS163, runs on an alternating license plate restriction that catches a meaningful number of rental drivers off guard, partly because of a detail that makes it genuinely impossible to plan around in advance.
🛣️ Road Reality: The SS163 coastal road (Vietri sul Mare to Positano) runs an alternating license plate system during peak periods: on even calendar dates, vehicles with even-ending plates are banned between 10:00 AM and 6:00 PM; on odd dates, odd-ending plates are banned. Rental cars are not exempt, and — this is the part that catches people out — you generally can’t know your plate number until you actually pick up the car, making it impossible to plan which days you’ll be allowed on the road before you arrive.
Before any long-distance drive out of Rome, it’s worth reviewing Italy’s toll road system, since the Rome-Salerno stretch runs largely on toll autostrada.
The Drive Itself: Rome to the Amalfi Region
The highway portion of this trip is the easy part. From Rome, the drive to Salerno (the eastern gateway to the Amalfi Coast) or Sorrento (the western gateway) runs largely on toll autostrada, typically taking somewhere in the range of three to four hours depending on your exact destination, traffic, and how many stops you make along the way. This stretch doesn’t involve anything unusual — standard highway driving, standard tolls, nothing specific to this route that a typical Italy road trip wouldn’t already prepare you for.
The complexity starts once you actually reach the coast itself and need to drive the SS163 — the narrow, cliffside road that connects the famous towns (Positano, Amalfi, Ravello, and the rest) and is the actual reason most people plan this trip in the first place. Since this is a longer, higher-mileage rental than a typical Rome day trip, it’s worth checking typical rental costs by vehicle class and booking with enough lead time, particularly if traveling during peak summer months when both availability and prices tighten.
The SS163 Alternating Plate Restriction, Explained Properly
This is the detail that derails more trip plans than anything else on this route. To manage chronic summer congestion, authorities enforce an alternating license plate system (targhe alterne) on the SS163 between Vietri sul Mare and Positano, roughly 55-60 kilometers of the most scenic and most trafficked stretch of the coast.
The mechanism: on even-numbered calendar dates, vehicles with a license plate ending in an even digit are banned from the road; on odd-numbered dates, odd-ending plates are banned. This applies during a specific daily window, typically 10:00 AM to 6:00 PM. The exact calendar periods when this restriction is active shift somewhat year to year — historically covering spring holiday weekends (Easter, late April/early May bridge holidays) and then a more extensive summer window covering weekends and holidays through June and July, extending to daily enforcement in August, tapering to weekends only in October. Always confirm the current year’s exact dates close to your trip rather than assuming last year’s schedule still applies.
| Calendar Date Type | Plates Banned | Hours | Applies to Rental Cars? |
|---|---|---|---|
| Even date (2nd, 4th, 6th…) | Even-ending plates | 10:00 AM – 6:00 PM | Yes |
| Odd date (1st, 3rd, 5th…) | Odd-ending plates | 10:00 AM – 6:00 PM | Yes |
| Outside 10 AM-6 PM | No restriction | — | — |
| Motorcycles/scooters | Exempt entirely | — | N/A |
A common and costly misconception: rental cars are not exempt from this restriction. Some travelers assume it only applies to local or commercial traffic — it doesn’t. If your rental car’s plate doesn’t match the permitted digit for that day, you’re not allowed to drive the restricted stretch during the enforcement window, full stop.
Why You Genuinely Can’t Plan Around It in Advance
Here’s the detail that makes this genuinely different from most travel restrictions: you typically don’t find out your rental car’s license plate number until you physically pick up the vehicle, which means it’s essentially impossible to know in advance which of your planned driving days will actually be permitted on the SS163. You could plan a perfect five-day coastal itinerary and discover at pickup that your assigned plate locks you out of the road on two of those days.
This single fact is the strongest argument for not building a rigid, date-specific coastal itinerary around driving the SS163 yourself. A trip plan that depends on driving that specific road on a specific day is planning against information you won’t have until you’re already there.
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What Size Car Actually Works on This Road
Separate from the plate restriction entirely, the SS163 itself is genuinely demanding to drive regardless of which days you’re permitted on it: narrow in places, with sharp hairpin turns, oncoming tour buses, and stretches where two passing vehicles need to carefully edge past each other — a level of tight, technical driving well beyond the roundabouts and standard road rules most visitors are already adjusting to elsewhere in Italy. The practical recommendation from experienced coastal drivers is consistent: book the smallest reasonable vehicle — something in the Fiat 500 or Fiat Panda class — rather than an SUV or larger sedan, which technically fits but adds meaningful stress at nearly every bend and makes parking in the coastal towns considerably harder to find. Given the genuine risk of minor scrapes on a road this tight, it’s also worth making sure your rental insurance coverage is something you’re comfortable with before attempting this drive specifically, and confirming your pickup documents are in order well before you’re standing at the counter with a long drive ahead of you.
The Honest Alternative: Park the Car, Take the Ferry
Given the plate restriction’s unpredictability and the road’s genuine driving difficulty, the most commonly recommended approach among experienced Amalfi Coast visitors isn’t actually to drive the SS163 yourself at all: park in Salerno or Sorrento and use the coastal ferry network to reach the individual towns instead. Ferries run independently of the plate restriction, connect the main coastal towns directly, and are generally faster point-to-point than driving the same route in summer traffic — Salerno to Amalfi runs roughly 35 minutes by boat, for comparison.
This doesn’t mean skipping the rental car for the whole trip — you’d still want it for the Rome-to-coast leg and any inland stops — it just means treating the SS163 itself as a “leave the driving to someone else” stretch rather than the centerpiece drive the marketing suggests it should be.
A Realistic Itinerary Structure
A structure that sidesteps most of the SS163’s genuine friction points: drive from Rome to Salerno or Sorrento (the easy highway portion), park the car for the coastal portion of the trip, use ferries or local buses to visit Positano, Amalfi, and Ravello without worrying about plate restrictions or parking at each stop, then collect the car again for the return drive or the next leg of a broader Italy road trip. This preserves the flexibility a rental car gives you for the rest of an Italy itinerary — including the kind of shorter day trips from Rome that a car genuinely does make easier — without fighting an unpredictable restriction on the one stretch where driving yourself adds the least value anyway.
FAQ
Are rental cars exempt from the Amalfi Coast’s alternating license plate restriction? No. This is a common misconception — rental cars are explicitly subject to the same restriction as any other non-exempt vehicle.
How do I know if my rental car’s plate is allowed on the SS163 on a given day? You generally can’t know in advance, since you’re not told the specific plate number until you pick up the vehicle — this makes planning a rigid coastal driving itinerary genuinely difficult.
What are the restriction hours on the SS163? Typically 10:00 AM to 6:00 PM on the affected dates, with the road open to all plates outside that window.
When exactly is the restriction active during the year? It varies annually but generally covers spring holiday weekends and a broader summer window (weekends through June-July, often daily in August, weekends again in October) — always confirm the current year’s specific dates before your trip.
What size rental car is best for driving the Amalfi Coast road? The smallest reasonable option, such as a Fiat 500 or Fiat Panda class vehicle — larger cars and SUVs are technically possible but add significant stress on the narrow, winding stretches.
Is it better to drive the SS163 myself or take a ferry between coastal towns? Many experienced visitors recommend parking in Salerno or Sorrento and using ferries for the coastal towns specifically, given the plate restriction’s unpredictability and the road’s genuine driving difficulty.
Are motorcycles and scooters affected by the alternating plate restriction? No, they’re exempt from the restriction entirely, which is part of why scooters are a common sight on the coast during restricted hours.
If I’m staying at a hotel on the coast, does the restriction still apply to me? Guests with a confirmed booking are typically exempt only for their scheduled arrival and departure day travel, not for general driving around the coast during the rest of their stay.
