Belgium
Cap in the app: 70 km/h.
Speed
70 km/h outside built-up areas in Flanders since 2017-01-01, 90 in Wallonia, 70 in Brussels. Motorway 120, but 90 for outfits over 3.5 tonnes. There is no trailer-specific rule in art. 11.
Source. AR 1er décembre 1975, art. 11 in the regional versions, Justel consolidation read 2026-08-07
Dimensions — two instruments, and a gap in one of them
Belgium splits the dimensions across two texts, and you have to read both.
The traffic regulation — arrêté royal du 1er décembre 1975 portant règlement général sur la police de la circulation routière, the same AR as article 11 with the speeds, Justel — governs the laden vehicle on the public road in art. 46:
46.1. La largeur d'un véhicule chargé, mesurée toutes saillies comprises, ne peut excéder les limites suivantes : 1° véhicule automobile, véhicule à traction animale ou leur remorque : (2,55) mètres ou 2,6 mètres lorsque le véhicule a une largeur de 2,6 mètres conformément au règlement technique des véhicules automobiles.
46.3. La hauteur d'un véhicule chargé ne peut dépasser 4 mètres.
Art. 46 contains no length limit at all — 46.2 is only about how far the load may project in front of and behind the vehicle. Art. 49, Trains de véhicules, sets none either: it governs how many trailers may be drawn and what the coupling must look like, and mentions 25 metres solely for fairground trains and advertising convoys at walking pace. For the length, art. 46.1 refers onwards to le règlement technique des véhicules automobiles.
The technical regulation is arrêté royal du 15 mars 1968 portant règlement général sur les conditions techniques auxquelles doivent répondre les véhicules automobiles et leurs remorques, Justel, the consolidation updated to 2025-03-21. The dimensions are in art. 32bis, which applies to vehicles whose type approval was applied for from 1985-01-01. The article divides vehicles into three classes: class I "véhicules destinés au transport de personnes", class II "les véhicules ou les combinaisons de véhicules destinés au transport de choses" under 44 tonnes, class III what is larger than class II and requires a special permit.
| Dimension | Belgium | Article |
|---|---|---|
| Width | 2.55 m (2.60 for temperature-controlled vehicles and swap bodies) | AR 1975 art. 46.1 1°; AR 1968 art. 32bis 2.1.1 and 3.1.1 |
| Height | 4.00 m, load included | AR 1975 art. 46.3; AR 1968 art. 32bis 2.1.2 and 3.1.2 |
| Length, caravan | 12.00 m (remorques, à l'exclusion des semi-remorques) | AR 1968 art. 32bis 3.1.3.2 |
| Length, motorhome | 12.00 m (véhicules à moteur, bus excepted) | AR 1968 art. 32bis 3.1.3.1 |
| Length, outfit | no limit that names a caravan outfit — see below | — |
Width and height therefore stand in both instruments with the same figures, which is a welcome confirmation. The outfit length is another matter.
The gap. The 18.75 metres usually given for Belgium stand in art. 32bis 3.1.3.5, and read in full "pour les trains routiers (camion et remorque) : 18,75 m, si le train satisfait aux conditions suivantes" — two geometric conditions about the distance from the front edge of the load space to the rear edge of the trailer (15.65 m and 16.40 m respectively). If they are not met, 18 m applies instead. The rule sits in class II, the goods vehicles, and was introduced by AR 2017-07-31/07, in force 2017-08-20, which is Belgium's transposition of directive (EU) 2015/719.
Class I, the passenger vehicles, gets in 2.1.3 a length per vehicle — 12 m for anything other than a bus, 18.75 m for an articulated bus and for a bus with a trailer — but no length for a combination. A car with a caravan is neither camion et remorque nor a bus with a trailer. No row in art. 32bis names that combination.
It is worth comparing with the article 32bis replaced. Art. 31, which still stands in the regulation for vehicles whose type approval was applied for before 1986, had an express catch-all rule: "3° Longueur d'un train de véhicules : … b) 18 m lorsqu'il s'agit d'un véhicule à soufflet ou un autre train de véhicules." That wording — another vehicle combination — covers anything with a trailer. When art. 32bis took over in 1985 the general rule was exchanged for rules by class, and car-with-trailer fell between the classes.
The conclusion is the same as Portugal's, but the other way round: Portugal's national text is wider than the directive it transposes and therefore catches a caravan outfit, Belgium's is as narrow as the directive and does not. To put 18.75 in Belgium's cell would be to borrow a goods-vehicle figure and call it national law. The cell therefore gets a footnote, not a figure.
The turning circle in art. 32bis 2.3.2 is the same EU requirement as Luxembourg's and Portugal's but expressed differently: outer radius 12.50 m, ring width at most 7.20 m — so inner radius 5.30 m — and at most 0.80 m outside the tangent. The same figures, different words.
The four versions of art. 32bis (federal, Walloon, Brussels, Flemish) have been checked separately and have identical figures on all four dimensions. Unlike the speed in art. 11, the dimensions are therefore not regionalised.