HAWK systems are sequenced lighting/beacons starting first with flashing yellow, then steady yellow, and finally steady red over a period of several seconds. Pedestrian signals at either end of the crosswalk display the ‘don't walk’ signal until the HAWK beacon displays the steady red signal.  Only then will the pedestrian light display the white ‘walk’ signal.

A US study on costs prepared for the Federal Highway Administration presents the average cost (in 2012 dollars) of HAWK systems at $75,000.  Other reports have the costs between $75,000 and $150,000. 

Overhead RA-5 signs with flashing amber beacons
 

Nova Scotia Department of Transportation and Infrastructure Renewal estimates the cost of RA-5 overhead signs with flashing amber beacons including materials, labour, poles, underground wiring and traffic controls at up to $30,000. 

Halifax Regional Municipality estimates costs of between $30,000 and $50,000
 

Rectangular Rapid Flashing Beacon (RRFB) 
 

RRFBs have a bright rapid strobe-like warning flash as compared to other flashing crosswalk beacons.  Halifax will be piloting this device at four locations in the near future.
 
One supplier quotes a two-sided system at a cost of approximately $8,500, although there will be additional installation costs.

RA-4 pedestrian signs are the standard signs posted at a marked crosswalk, attached to a post.

The cost of each of these signs/posts, in conjunction with the painting of two lines across the roadway is $500 to $1,000, depending on number of lanes.

Annual maintenance costs are estimated at $300 to $500, again depending on the number of lanes.

In road crossing signs
 

In road pylons are used in a number of cities and regions including Quebec City, many north-east US states, Georgia, the Carolinas etc.
 
One US supplier quotes the price of a pylon at $500.

‘Zebra’ road markings

 Painting solid zebra road markings is of course more expensive than painting two lines.
 
The cost of ‘zebra’ markings in the Halifax Regional Municipality is $250 to $400 per crosswalk in the first year and $150 to $250 per crosswalk each subsequent year.
 
Nova Scotia Transportation and Infrastructure Renewal use a more expensive slip-resistant thermoplastic material inlayed into the asphalt.  This approach has an initial cost of approximately $2,000 per two-lane crosswalk, although the higher quality material results in significantly lower maintenance costs in subsequent years.
 

Crosswalk flags