Limitations in current traffic monitoring abilities are an ongoing negative issue for the Arizona Department of Transportation (ADOT) and for its customers in both urban and rural areas. In this research project, Texas Transportation Institute (TTI) performed a state-of-the-practice review that intended to assist the ADOT and other Arizona transportation agencies in identifying the most important technologies for detecting vehicles and determining traffic volume, speed, and lane occupancy. Their research aimed to assist these transportation agencies in making informed decisions so that they can invest wisely. The scope of this project required the development of a design for a detector testbed facility, which ADOT proposed to develop in the Phoenix area in the near future.

The research objectives were to:

• Gather information on the current vehicle detection systems used in Arizona.
• Identify the most promising vehicle detection technologies to meet the needs of ADOT and other Arizona agencies.
• Identify candidate test sites, develop preliminary site design, and develop field test evaluation plan.
• Develop a detailed design of the detection testbed on the selected freeway segment.

Program Budget:

The initial cost of the testbed included detectors sufficient to ultimately cover eight lanes in the westbound direction (there were seven lanes at the start of the study) and six lanes in the eastbound direction. Besides the detectors, the total cost estimate includes a 12 ft by 12 ft node building, three equipment cabinets, inductive loops for the baseline system, conduit, and boring. The total cost of the facility is estimated to be approximately $566,000. Some components were provided by ADOT at no cost to the project. However, all proposed traffic detector systems evaluated were included in the budget estimate. Other major cost elements included infrastructure, communications, detector mountings, node building, design package, construction management, and contingency.

Anticipated initial testbed costs are shown in the table below:

Description	Unit	Qty Ph1	Qty Ph2	Unit Cost ($)	Phase 1 ($)	Phase 2 ($)	Total Cost ($)
8 ft chain link fence, 10' x 10'	LF	40	0	12.95	518.14	-	518.14
Pedestrian gate (4'X 6') (Barb top)	EA	1	0	355.00	355.00	-	355.00
Concrete pad, 12' x 12'	SF	144	0	34.73	5,001.12	-	5,001.12
Lightning rods and cable	EA	1	0	250.00	250.00	-	250.00
Hardware firewall	EA	1	0	650.00	650.00	-	650.00
Industrial computers	EA	0	0	2,500.00	-	-	-
Weather station	EA	0	1	5,000.00	-	5,000.00	5,000.00
Network Ethernet hubs (high temperature)	EA	1	1	400.00	400.00	-	400.00
Direct burial Ethernet cable	LF	0	525	0.31	162.75	-	162.75
Barriers and crash cushions	LF	0	0	-	-	-	-
Roadway bore and 4" conduit	LF	270	236	63.00	17,010.00	14,868.00	31,878.00
2' x 4' pullboxes (use ADOT #7 with extension)	EA	6	5	1,500.00	-	-	-
3' x 5' pullboxes (use ADOT #9 pullbox)	EA	5	1	3,400.00	17,000.00	3,400.00	20,400.00
Install pullboxes (#7)	Lump	1	0	8,000.00	5,000.00	3,000.00	8,000.00
Surge protector for power service	EA	1	0	150.00	150.00	-	150.00
Peek ADR-6000 (8 lanes WB and 6 lanes EB)	EA	1	1	35,000.00	45,000.00	35,000.00	80,000.00
Loop installation for Peek ADR-6000	Lump	1	1	3,000.00	24,000.00	18,000.00	42,000.00
Traffic Control for Installing ADR-6000 loops	LA	8	6	2,000.00	16,000.00	12,000.00	28,000.00
SmartSensor SS-125 vehicle detector	EA	1	1	8,000.00	8,000.00	8,000.00	16,000.00
Autoscope Solo Pro	EA	1	1	6,500.00	6,500.00	6,500.00	13,000.00
Sensys Networks mag. & epoxy (14 lanes, 2/la)	EA	16	12	465.00	7,440.00	5,580.00	13,020.00
Sensys Networks Access Point & hardware	EA	1	1	3,300.00	3,300.00	3,300.00	6,600.00
GTT (3M), detector cards (all lanes)	Lump	1	1	-	17,170.40	12,877.00	30,048.20
GTT (3M) bore (initiate from median)	LF	232	184	50.00	11,600.00	9,200.00	20,800.00
Pole structure 40' to be provided by ADOT	EA	1	1	20,000.00	-	-	-
Pole structure 40' to be provided by ADOT	EA	1	1	3,000.00	3,000.00	3,000.00	6,000.00
4" PVC conduit (pull box interconnect, etc)	LF	302	178	28.00	8,456.00	4,984.00	13,440.00
1" PVC conduit (for fiber connection)	LF	200	0	18.00	3,600.00	-	3,600.00
3" PVC for pull box interconnections, power, coaxial		197	198	25.00	4,925.00	4,950.00	9,875.00
3" steel conduit for sign bridge	LF	98	78	93.00	9,114.00	7,254.00	16,368.00
Equipment cabinets, large (Type 341) by ADOT	EA	3	1	8,000.00	-	-	-
Cabinet foundations	EA	3	1	2,000.00	6,000.00	2,000.00	8,000.00
Equipment cabinets, small (Type 343) by ADOT	EA	2	1	2,000.00	-	-	-
Node building (small)	EA	1	0	32,000.00	32,000.00		32,000.00
Subtotal					252,602.41	158,913.80	411,516.21
Bid package (10% of Subtotal)	Lump	1			25,260.24	15,891.38	41,151.62
Construction management (15% of Subtotal)	Lump	1			37,890.36	23,837.07	61,727.43
Grand Subtotal					315,753.01	198,642.25	514,395,26
Contingency (10%)					31,575.30	19,864.23	51,439.53
Grand Total					347,328.31	218,506.48	565,834.79