ST9602-CS000310City
County
District
- GUIDE FOR DETERMININ--
TI1VfL _ ~EQUIREMENTS FOR TRAFFIC SIGi., ~L PR FFMPTION
AT HIGHWAY-RAIL GRADE CROSSINGS
Date .~ .-/O - .~ OOO
Completed by Don ,~r~ ~
District Approval ~'
Parallel Street Name
Railroad
Crossing DOT#
~ S~eet .Name Crossing Trafk ac~q r bh v r
Parallel Road
Traffic Signal "+
_ 5. !, I .... /, ........
- ' ~Wa. ming Device
7qoPo&Z~
Raikoad Contact
Phone
TIME FOR PARALLEL ROAD BEFORE SERVICING THE TRACK PHASE
THE GREATER OF:
MIN GREEN BEFORE PREEMPT 0 - 4 SECONDS -4[ SECONDS
OR
PEDHSTRIAN CLEARANCE TIME AS REQUIRED ~3,-~SECONDS
PLUS:
CLEARANCE TIME = yl~.! OW + ALL RED (4 - 8 SECONDS~
(NORMAL IN i.e. tqSECTION CI J:{ARANCE TI34E) .:q SECONDS
TOTAL ~ BEFORE SERVICING THE TRACK PHASE ~ff,~SECONDS
TRACK CLEARANCE GREEN FOR DISTANCE L
Minimum Desirable
L = 25 6 SECONDS 10 SECONDS
L = 50 7 SECONDS 10 SECONDS
L = 75 9 SECONDS 10 SECONDS
L = 100 10 SECONDS 12 SECONDS
L= 125 11 SECONDS 14 SECONDS
L = 150 12 SECONDS 17 SECONDS
L = 175 14 SECONDS 19 SECONDS
L = 200 15 SECONDS 2f SECONDS :
L>200 . AS DI~,'IER_,5,flJqED ASDI~i/~]]NVED
TOTAL TRACK CLEARANCE Gi~N' TIME ~ SECONDS
TOTAL TIME REQUIRED FOR TRACK CLEARANCE ~0,offSECONDS
NOTE: IF TOTAL TIME REQUIRED FOR TRACK CLEARANCE IS LESS THAN TOTAL RR WARNING
TIME, SIMULTANTEOUS PREEMPTION IS ALL THAT IS REQUIRED.
,4 o, 5' - 20 SEcoNDs =
TOTAL ~ ~
REQUIRED FOR RR WARNING
TRACK CLEARANCE * TIME
TIME TO BE
ADDED TO RR
WARNING TIME
* Does not include RR instrument lag time.
DAt~mp\preemptf. doc FEBRUARY 1998