TOW­ING SPEED AND DIS­TANCE

SCE­NARIO 1 – EMER­GENCY STOP ON A LEVEL STRETCH OF TARRED ROAD

Go! Drive and Camp Camp Guide - - On The Open Road -

Gen­tly ap­ply­ing brakes in­ter­mit­tently and gear­ing down care­fully must surely be the safest way to bring a tow­ing com­bi­na­tion to a halt. It pre­vents the car­a­van from jack-knif­ing. How­ever, when a kudu sud­denly ap­pears out of the blue or if that lorry that has just over­taken you loses its load, there’s noth­ing you can do but hit the brakes.

A B

113 m

6s 4,7 s Start brak­ing Start brak­ing

120 km/h If the tow­ing com­bi­na­tion is mov­ing along on a straight and level road at 120 km/h and you have to stop un­ex­pect­edly, it will take 6 se­conds (in­clud­ing the 0,8 sec­ond re­ac­tion time) to come to a com­plete halt over a dis­tance of 113 m. This im­plies that the wheels of the bakkie keep rolling and do not start to skid. If the wheels do lose their grip and skid – which can hap­pen if the bakkie doesn’t have an ABS (anti-lock brak­ing sys­tem) – it will take 8 se­conds and al­most 150 m to stop. 90 km/h 68 m If the bakkie towed at 30 km/h less (at 90 km/h), it would still take the driver 4,7 se­conds to stop the com­bi­na­tion, bit over a con­sid­er­ably shorter dis­tance of about 68 m. And if the the wheels lose their grip, the driver could stop af­ter 6,2 se­conds within 90 m.

Newspapers in English

Newspapers from South Africa

© PressReader. All rights reserved.