(32SII) Stopping Sight Distance - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Software Libraries (/forum-10.html) +--- Forum: General Software Library (/forum-13.html) +--- Thread: (32SII) Stopping Sight Distance (/thread-1075.html) (32SII) Stopping Sight Distance - Eddie W. Shore - 04-10-2014 12:32 PM Input: Y: speed of vehicle or design speed (mi/hr) X: grade of the road (i.e. for 1% grade enter as 1) Output: X: Stopping Sight Distance (in feet) Formula used: SSD = 55/15 * V + 1.075*V^2/(11+.32*G) Assumptions: * Total reaction time is 2.5 seconds. The deceleration rate of the vehicle is 11 ft/s^2. Both values are recommended by the AASHTO (American Association of State Highway and Transportation Officials). Program: S01 LBL S S02 0.32 S03 * S04 11.2 S05 + S06 1/x S07 1.075 S08 * S09 x<>y S10 ENTER S11 R-down S12 x^2 S13 * S14 R-up S15 55 S16 * S17 15 S18 ÷ S19 + S20 RTN Size: 54.0 Checksum: 2343 Examples: Input: Y: 65 (V) X: 2 (G) Result (Fix 4): 621.9376 ft Input: Y: 35 (V) X: -4 (G) Result: 261.0828 Reference: Source: Goswami, Indramil Ph.D. P.E. "All In One Civil Engineering PE Breadth and Depth Exam Guide" 2nd Edition. McGraw Hill: 2012 RE: HP 32SII: Stopping Sight Distance - everettr - 04-10-2014 03:21 PM Y: 1 G: -34 Result: Runaway! :-) RE: HP 32SII: Stopping Sight Distance - Eddie W. Shore - 04-14-2014 07:35 PM (04-10-2014 03:21 PM)everettr Wrote:  Y: 1 G: -34 Result: Runaway! :-) RE: HP 32SII: Stopping Sight Distance - Mark Hardman - 04-14-2014 09:08 PM (04-14-2014 07:35 PM)Eddie W. Shore Wrote:   (04-10-2014 03:21 PM)everettr Wrote:  Y: 1 G: -34 Result: Runaway! :-) Or add it to a stage of the Tour de France--going uphill of course. Only 81 days and counting until Le Grand Départ. Mark Hardman RE: HP 32SII: Stopping Sight Distance - CosmicTruth - 06-02-2014 12:26 AM 50G: 'SHSSD' %%HP: T(3)A(D)F(.); \<< \-> Y X \<< Y "SPEED" \->TAG X "GRADE" \->TAG X .32 * 11.2 + INV 1.075 * Y SQ * Y 55. * 15. / + "SSD" \->TAG \>> \>>