WorkshopScheme Design for 20 mph scheme

Graham Hanson

Reduced time and cost of scheme delivery

20mph zones• Sign illumination can be relaxed throughout a 20mph

limit/zone – subject to risk analysis• Remove the requirement for terminal signs to be placed

on both sides of the road• Repeater signs can be used as a physical feature• Remove the requirement for a speed roundel to be

accompanied by an upright sign• Provided new signs for 20mph part-time limits

Maximum speed limit

Requirements of directions

Traffic management costs

• Average speed hump = £2000• Illuminated traffic sign =£600• Energy costs and maintenance = £100 pa• Cost to place an unilluminated sign = £200• Cost to place pair of unilluminated signs (back to

back) = £300• Cost to mark a parking bay = £500

Scheme costs

Total cost = £36,200• 8 x speed hump = £2000 x 8 = £16000• Illuminated traffic sign = £600 x 16 = £9600• Energy costs and maintenance = £100 pa =

£1600 x 5 = £8000• 4 back-to-back signs for zone = £4 x £300 =

£1200• 2 x unilluminated parking signs = 2 x £200 =

£400• Mark 2 x parking bay = £500 x 2 = £1000

Questions