Swedish term
40 years' industry experience
Native in: English 
Works in: German to English, Portuguese to English, Spanish to English, and 7 more.
Styrbil
"Varningsbil eller vägtransportledarfordon får inte vara s.k. styrbil"
| 3 | remote-steer vehicle / rear-steer truck |
Per-Erik Nordström
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| 4 | tractor |
Michael Ellis
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| 3 -2 | 'drone mobile' remote-control vehicle |
Adrian MM.
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| 1 | push truck |
Per-Erik Nordström
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Proposed translations
Sweden
Linguist | writer | translator
Native in: Swedish (Variants: Rikssvenska, Finlandssvenska, Stockholm)
Works in: English to Swedish, Swedish to English
remote-steer vehicle / rear-steer truck
Austria
Retd.T&I, Barrister & Austro-Advokat
Native in: English (Variants: British, Scottish) 
Works in: Spanish to English, English to Spanish, French to English, and 5 more.
'drone mobile' remote-control vehicle
The driver needs to be in the car and in charge, rather than the vehicle being steered from afar.#
Not too different from flying model aircraft, perhaps.
Omslagsbild Styrbil med fjärrkontroll
Ladda Ner Styrbil med fjärrkontroll - Senaste Version 96.0 För Android Av abduquena - Fjärrkontroll Car Lock Key Remote Control:
| disagree |
Christopher Schröder
: How many remote control cars do you see on the road?🙄 It’s a vehicle from which the trailer can be steered remotely.
1 hr
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Then you ought to have posted your own answer instead of criticizing mine that waited 8 hours for you to wake up + pinch my remote idea https://www.yourarticlelibrary.com/electrical-engineering/mi...
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| disagree |
Per-Erik Nordström
: There is no such thing in heavy haulage.
13 hrs
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https://www.yourarticlelibrary.com/electrical-engineering/mi...
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Sweden
Linguist | writer | translator
Native in: Swedish (Variants: Rikssvenska, Finlandssvenska, Stockholm)
Works in: English to Swedish, Swedish to English
push truck
United Kingdom
Extensive experience in industry
Native in: English (Variants: British, US)
Works in: Swedish to English, Norwegian to English
tractor
Reference 1 is a photo of the inside of the cab of a 'styrbil' or tractor part of an articulated truck and Ref 2 gives a nice film of a toy radio-controlled(!) tractor hooking on to its load bearing trailer.
You may wish to extend the description to "Tractor or towing vehicle"
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Note added at 1 day 1 hr (2021-11-01 15:17:27 GMT)
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In view of Ice Scream's reference. I recommend you reword the sentence to:
The warning vehicle is not to be a vehicle concerned directly or indirectly with the carriage or towing of the abnormal load"
The escort vehicle or abnormal load warning vehicle may not be the tractor part of the abnormal load combination.
Discussion
There is no simple translation, so I recommend rewording the whole sentence - see note on my answer.
http://ipaper.ipapercms.dk/Scania/Sverige/ScaniaMil/2013/Sca...