ST9304-CS 960319
MEMORANDUM
To: Mayor Tom Morton
Via: Jim Witt, City Manager
From: Kenneth M. Griffin, P.E., ACM/City Engineer
RE: Belt Line / MacArthur Dual Left Turn Lanes
and Royal Lane Extension
Date: March 19, 1996
This memo is written in response to the following two inquiries by the Mayor:
1. At Belt Line and MacArthur are the dual left turn lanes permanent or can they be made
permanent?
Currently, they are not permanent, they are actuated by the signal on the mast arm for peak hour
traffic. Yes, they can be made permanent, however, to do so would entail the following:
Extend the rubberized crossing approximately 25'
Install additional loop detector and pull boxes
Relocate the north bound left turn signal pole or extend the north bound mast arm
Remove and replace existing landscaping and irrigation
If the dual left are made permanent, then we would also want to go to lengthen the left turn
storage lane to accommodate the peak hour turning movements.
Extend the railroad crossing arm
Remove and replace necessary signage as needed.
Stripe and button for the left turn lane
Extend the mast arm for the south bound approach with the appropriate signal head
Install brick pavers in the new lanes
It is estimated that the cost to do this would exceed $100,000 and also require the cooperation of
DART.
2. Cost of Royal Lane Extension to Sandy Lake Road?
The approximate length of extension is 1300 feet and the estimated cost is $600,000. The paving
is only about 25% of the cost. The remainder is drainage cost. The Royal Lane plans from 1988
show a box culvert for the entire length of the extension to be built with the west side of Royal
Lane.
file/kgriffin/bltlnmac.may