It includes improvements to signing and road markings, high-friction surfacing, trimming back vegetation to improve visibility, and alterations to a number of speed limits on the route.
A report presented to the county council's south Chichester county local committee said the section of road, between Chichester and Cocking, was 13.2km long.
During the five years to June, 2009, there had been 71 injury accidents, resulting in two fatal, 22 serious and 91 slight casualties.
"Evaluation of the schemes has shown that a package of measures along a route where high rates of casualties are occurring can be very successful in reducing vehicle speeds and the number and severity of
accidents," the report added.
The schemes had been developed for implementation in 2010-11, subject to no unresolved objections after they were advertised.
One of the proposals recommended by the officers was to extend an existing 30mph speed limit on the A286 Broyle Road, Chichester.
The committee agreed it should be extended further than proposed, up to the city boundary. Plans also include:
* Reducing the 40mph speed limit in Lavant to 30mph.
* Moving the 30mph limit north of Singleton to the northern edge of the village, and introducing a 475m 40mph buffer.
* Improvements to signing and road markings.
* High-friction surfacing on the A286 at the junction with
* 'Gateway' treatments at speed-limit terminals.
* Vehicle-activated signs (VAS) in Lavant and Cocking, and,
subject to identifying suitable locations, at West Dean and Singleton.
These are roadside digital signs which display a message when they are approached by a driver exceeding the speed limit or going too fast.
* An improved pedestrian crossing point adjacent to West Dean School.
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