Workshop Scheme Design for 20 mph scheme Graham Hanson
Jan 20, 2015
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